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Diff for: ‎README.md

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| # | Title | Solution | Difficulty |
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| :-: | - | - | :-: |
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| <span id="1224">1224</span> | [Maximum Equal Frequency](https://leetcode.com/problems/maximum-equal-frequency "最大相等频率") | [Go](https://github.com/openset/leetcode/tree/master/problems/maximum-equal-frequency) | Hard |
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| <span id="1223">1223</span> | [Dice Roll Simulation](https://leetcode.com/problems/dice-roll-simulation "掷骰子模拟") | [Go](https://github.com/openset/leetcode/tree/master/problems/dice-roll-simulation) | Medium |
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| <span id="1222">1222</span> | [Queens That Can Attack the King](https://leetcode.com/problems/queens-that-can-attack-the-king "可以攻击国王的皇后") | [Go](https://github.com/openset/leetcode/tree/master/problems/queens-that-can-attack-the-king) | Medium |
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| <span id="1221">1221</span> | [Split a String in Balanced Strings](https://leetcode.com/problems/split-a-string-in-balanced-strings "分割平衡字符串") | [Go](https://github.com/openset/leetcode/tree/master/problems/split-a-string-in-balanced-strings) | Easy |
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| <span id="1220">1220</span> | [Count Vowels Permutation](https://leetcode.com/problems/count-vowels-permutation "统计元音字母序列的数目") | [Go](https://github.com/openset/leetcode/tree/master/problems/count-vowels-permutation) | Hard |
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| <span id="1219">1219</span> | [Path with Maximum Gold](https://leetcode.com/problems/path-with-maximum-gold "黄金矿工") | [Go](https://github.com/openset/leetcode/tree/master/problems/path-with-maximum-gold) | Medium |
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| <span id="1218">1218</span> | [Longest Arithmetic Subsequence of Given Difference](https://leetcode.com/problems/longest-arithmetic-subsequence-of-given-difference "最长定差子序列") | [Go](https://github.com/openset/leetcode/tree/master/problems/longest-arithmetic-subsequence-of-given-difference) | Medium |

Diff for: ‎problems/count-vowels-permutation/README.md

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[< Previous](https://github.com/openset/leetcode/tree/master/problems/path-with-maximum-gold "Path with Maximum Gold")
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Next >
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[Next >](https://github.com/openset/leetcode/tree/master/problems/split-a-string-in-balanced-strings "Split a String in Balanced Strings")
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## [1220. Count Vowels Permutation (Hard)](https://leetcode.com/problems/count-vowels-permutation "统计元音字母序列的数目")
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Diff for: ‎problems/dice-roll-simulation/README.md

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<!--|This file generated by command(leetcode description); DO NOT EDIT. |-->
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<!--+----------------------------------------------------------------------+-->
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<!--|@author openset <[email protected]> |-->
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<!--|@link https://github.com/openset |-->
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<!--|@home https://github.com/openset/leetcode |-->
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<!--+----------------------------------------------------------------------+-->
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[< Previous](https://github.com/openset/leetcode/tree/master/problems/queens-that-can-attack-the-king "Queens That Can Attack the King")
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[Next >](https://github.com/openset/leetcode/tree/master/problems/maximum-equal-frequency "Maximum Equal Frequency")
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## [1223. Dice Roll Simulation (Medium)](https://leetcode.com/problems/dice-roll-simulation "掷骰子模拟")
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<p>A die simulator generates a random number from 1 to 6 for each roll.&nbsp;You introduced a constraint to the generator such that it cannot roll the number <code>i</code> more than <code>rollMax[i]</code> (1-indexed) <strong>consecutive</strong> times.&nbsp;</p>
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<p>Given an array of integers&nbsp;<code>rollMax</code>&nbsp;and an integer&nbsp;<code>n</code>, return the number of distinct sequences that can be obtained with exact <code>n</code> rolls.</p>
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<p>Two sequences are considered different if at least one element differs from each other. Since the answer&nbsp;may be too large,&nbsp;return it modulo <code>10^9 + 7</code>.</p>
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<p>&nbsp;</p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> n = 2, rollMax = [1,1,2,2,2,3]
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<strong>Output:</strong> 34
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<strong>Explanation:</strong> There will be 2 rolls of die, if there are no constraints on the die, there are 6 * 6 = 36 possible combinations. In this case, looking at rollMax array, the numbers 1 and 2 appear at most once consecutively, therefore sequences (1,1) and (2,2) cannot occur, so the final answer is 36-2 = 34.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> n = 2, rollMax = [1,1,1,1,1,1]
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<strong>Output:</strong> 30
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> n = 3, rollMax = [1,1,1,2,2,3]
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<strong>Output:</strong> 181
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</pre>
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<p>&nbsp;</p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 &lt;= n &lt;= 5000</code></li>
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<li><code>rollMax.length == 6</code></li>
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<li><code>1 &lt;= rollMax[i] &lt;= 15</code></li>
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</ul>
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### Related Topics
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[[Dynamic Programming](https://github.com/openset/leetcode/tree/master/tag/dynamic-programming/README.md)]
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### Hints
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<details>
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<summary>Hint 1</summary>
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Think on Dynamic Programming.
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</details>
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<details>
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<summary>Hint 2</summary>
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DP(pos, last) which means we are at the position pos having as last the last character seen.
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</details>

Diff for: ‎problems/find-smallest-common-element-in-all-rows/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/minimum-time-to-build-blocks "Minimum Time to Build Blocks")
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## [1198. Find Smallest Common Element in All Rows (Medium)](https://leetcode.com/problems/find-smallest-common-element-in-all-rows "")
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## [1198. Find Smallest Common Element in All Rows (Medium)](https://leetcode.com/problems/find-smallest-common-element-in-all-rows "找出所有行中最小公共元素")
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Diff for: ‎problems/how-many-apples-can-you-put-into-the-basket/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/minimum-knight-moves "Minimum Knight Moves")
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## [1196. How Many Apples Can You Put into the Basket (Easy)](https://leetcode.com/problems/how-many-apples-can-you-put-into-the-basket "")
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## [1196. How Many Apples Can You Put into the Basket (Easy)](https://leetcode.com/problems/how-many-apples-can-you-put-into-the-basket "最多可以买到的苹果数量")
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Diff for: ‎problems/maximum-equal-frequency/README.md

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<!--|This file generated by command(leetcode description); DO NOT EDIT. |-->
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<!--+----------------------------------------------------------------------+-->
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<!--|@author openset <[email protected]> |-->
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<!--|@link https://github.com/openset |-->
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<!--|@home https://github.com/openset/leetcode |-->
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<!--+----------------------------------------------------------------------+-->
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[< Previous](https://github.com/openset/leetcode/tree/master/problems/dice-roll-simulation "Dice Roll Simulation")
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Next >
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## [1224. Maximum Equal Frequency (Hard)](https://leetcode.com/problems/maximum-equal-frequency "最大相等频率")
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<p>Given an array <code>nums</code>&nbsp;of positive integers, return the longest possible length of an array prefix of <code>nums</code>, such that it is possible to remove <strong>exactly one</strong> element from this prefix so that every number that has appeared in it will have the same number of occurrences.</p>
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<p>If after removing one element there are no remaining elements, it&#39;s still considered that every appeared number has the same number of ocurrences (0).</p>
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<p>&nbsp;</p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [2,2,1,1,5,3,3,5]
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<strong>Output:</strong> 7
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<strong>Explanation:</strong> For the subarray [2,2,1,1,5,3,3] of length 7, if we remove nums[4]=5, we will get [2,2,1,1,3,3], so that each number will appear exactly twice.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,1,1,2,2,2,3,3,3,4,4,4,5]
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<strong>Output:</strong> 13
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,1,1,2,2,2]
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<strong>Output:</strong> 5
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</pre>
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<p><strong>Example 4:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [10,2,8,9,3,8,1,5,2,3,7,6]
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<strong>Output:</strong> 8
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</pre>
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<p>&nbsp;</p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>2 &lt;= nums.length &lt;= 10^5</code></li>
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<li><code>1 &lt;= nums[i] &lt;= 10^5</code></li>
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</ul>
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### Related Topics
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[[Hash Table](https://github.com/openset/leetcode/tree/master/tag/hash-table/README.md)]
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### Hints
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<details>
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<summary>Hint 1</summary>
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Keep track of the min and max frequencies.
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</details>
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<details>
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<summary>Hint 2</summary>
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The number to be eliminated must have a frequency of 1, same as the others or the same +1.
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</details>

Diff for: ‎problems/minimum-absolute-difference/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/ugly-number-iii "Ugly Number III")
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## [1200. Minimum Absolute Difference (Easy)](https://leetcode.com/problems/minimum-absolute-difference "")
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## [1200. Minimum Absolute Difference (Easy)](https://leetcode.com/problems/minimum-absolute-difference "最小绝对差")
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<p>Given an&nbsp;array&nbsp;of <strong>distinct</strong>&nbsp;integers <code>arr</code>, find all pairs of elements with the minimum absolute difference of any two elements.&nbsp;</p>
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Diff for: ‎problems/minimum-knight-moves/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/find-smallest-common-element-in-all-rows "Find Smallest Common Element in All Rows")
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## [1197. Minimum Knight Moves (Medium)](https://leetcode.com/problems/minimum-knight-moves "")
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## [1197. Minimum Knight Moves (Medium)](https://leetcode.com/problems/minimum-knight-moves "进击的骑士")
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Diff for: ‎problems/minimum-time-to-build-blocks/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/minimum-absolute-difference "Minimum Absolute Difference")
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## [1199. Minimum Time to Build Blocks (Hard)](https://leetcode.com/problems/minimum-time-to-build-blocks "")
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## [1199. Minimum Time to Build Blocks (Hard)](https://leetcode.com/problems/minimum-time-to-build-blocks "建造街区的最短时间")
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Diff for: ‎problems/queens-that-can-attack-the-king/README.md

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<!--|This file generated by command(leetcode description); DO NOT EDIT. |-->
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<!--+----------------------------------------------------------------------+-->
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<!--|@author openset <[email protected]> |-->
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<!--|@link https://github.com/openset |-->
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<!--|@home https://github.com/openset/leetcode |-->
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<!--+----------------------------------------------------------------------+-->
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[< Previous](https://github.com/openset/leetcode/tree/master/problems/split-a-string-in-balanced-strings "Split a String in Balanced Strings")
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[Next >](https://github.com/openset/leetcode/tree/master/problems/dice-roll-simulation "Dice Roll Simulation")
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## [1222. Queens That Can Attack the King (Medium)](https://leetcode.com/problems/queens-that-can-attack-the-king "可以攻击国王的皇后")
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<p>On an <strong>8x8</strong> chessboard, there can be multiple Black Queens and one White King.</p>
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<p>Given an array of integer coordinates <code>queens</code> that represents the positions of the Black Queens, and a pair of coordinates <code>king</code> that represent the position of the White King, return the coordinates of all the queens (in any order) that can attack the King.</p>
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<p>&nbsp;</p>
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<p><strong>Example 1:</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2019/10/01/untitled-diagram.jpg" style="width: 321px; height: 321px;" /></p>
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<pre>
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<strong>Input:</strong> queens = [[0,1],[1,0],[4,0],[0,4],[3,3],[2,4]], king = [0,0]
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<strong>Output:</strong> [[0,1],[1,0],[3,3]]
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<strong>Explanation:</strong>&nbsp;
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The queen at [0,1] can attack the king cause they&#39;re in the same row.
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The queen at [1,0] can attack the king cause they&#39;re in the same column.
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The queen at [3,3] can attack the king cause they&#39;re in the same diagnal.
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The queen at [0,4] can&#39;t attack the king cause it&#39;s blocked by the queen at [0,1].
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The queen at [4,0] can&#39;t attack the king cause it&#39;s blocked by the queen at [1,0].
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The queen at [2,4] can&#39;t attack the king cause it&#39;s not in the same row/column/diagnal as the king.
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</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong><img alt="" src="https://assets.leetcode.com/uploads/2019/10/01/untitled-diagram-1.jpg" style="width: 321px; height: 321px;" /></strong></p>
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<pre>
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<strong>Input:</strong> queens = [[0,0],[1,1],[2,2],[3,4],[3,5],[4,4],[4,5]], king = [3,3]
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<strong>Output:</strong> [[2,2],[3,4],[4,4]]
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</pre>
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<p><strong>Example 3:</strong></p>
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<p><strong><img alt="" src="https://assets.leetcode.com/uploads/2019/10/01/untitled-diagram-2.jpg" style="width: 321px; height: 321px;" /></strong></p>
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<pre>
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<strong>Input:</strong> queens = [[5,6],[7,7],[2,1],[0,7],[1,6],[5,1],[3,7],[0,3],[4,0],[1,2],[6,3],[5,0],[0,4],[2,2],[1,1],[6,4],[5,4],[0,0],[2,6],[4,5],[5,2],[1,4],[7,5],[2,3],[0,5],[4,2],[1,0],[2,7],[0,1],[4,6],[6,1],[0,6],[4,3],[1,7]], king = [3,4]
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<strong>Output:</strong> [[2,3],[1,4],[1,6],[3,7],[4,3],[5,4],[4,5]]
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</pre>
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<p>&nbsp;</p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 &lt;= queens.length&nbsp;&lt;= 63</code></li>
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<li><code>queens[0].length == 2</code></li>
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<li><code>0 &lt;= queens[i][j] &lt;&nbsp;8</code></li>
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<li><code>king.length == 2</code></li>
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<li><code>0 &lt;= king[0], king[1] &lt; 8</code></li>
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<li>At most one piece is allowed in a cell.</li>
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</ul>
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### Related Topics
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[[Array](https://github.com/openset/leetcode/tree/master/tag/array/README.md)]
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### Hints
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<details>
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<summary>Hint 1</summary>
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Check 8 directions around the King.
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</details>
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<details>
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<summary>Hint 2</summary>
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Find the nearest queen in each direction.
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</details>

Diff for: ‎problems/reorder-data-in-log-files/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/range-sum-of-bst "Range Sum of BST")
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## [937. Reorder Data in Log Files (Easy)](https://leetcode.com/problems/reorder-data-in-log-files "")
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## [937. Reorder Data in Log Files (Easy)](https://leetcode.com/problems/reorder-data-in-log-files "重新排列日志文件")
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<p>You have an array of <code>logs</code>.&nbsp; Each log is a space delimited string of words.</p>
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Diff for: ‎problems/smallest-string-with-swaps/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/sort-items-by-groups-respecting-dependencies "Sort Items by Groups Respecting Dependencies")
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## [1202. Smallest String With Swaps (Medium)](https://leetcode.com/problems/smallest-string-with-swaps "")
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## [1202. Smallest String With Swaps (Medium)](https://leetcode.com/problems/smallest-string-with-swaps "交换字符串中的元素")
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<p>You are given a string <code>s</code>, and an array of pairs of indices in the string&nbsp;<code>pairs</code>&nbsp;where&nbsp;<code>pairs[i] =&nbsp;[a, b]</code>&nbsp;indicates 2 indices(0-indexed) of the string.</p>
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</ul>
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### Related Topics
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[[Array](https://github.com/openset/leetcode/tree/master/tag/array/README.md)]
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[[Union Find](https://github.com/openset/leetcode/tree/master/tag/union-find/README.md)]
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[[Array](https://github.com/openset/leetcode/tree/master/tag/array/README.md)]
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### Hints
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<details>

Diff for: ‎problems/sort-items-by-groups-respecting-dependencies/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/last-person-to-fit-in-the-elevator "Last Person to Fit in the Elevator")
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## [1203. Sort Items by Groups Respecting Dependencies (Hard)](https://leetcode.com/problems/sort-items-by-groups-respecting-dependencies "")
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## [1203. Sort Items by Groups Respecting Dependencies (Hard)](https://leetcode.com/problems/sort-items-by-groups-respecting-dependencies "项目管理")
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<p>There are&nbsp;<code>n</code>&nbsp;items each&nbsp;belonging to zero or one of&nbsp;<code>m</code>&nbsp;groups where <code>group[i]</code>&nbsp;is the group that the <code>i</code>-th item belongs to and it&#39;s equal to <code>-1</code>&nbsp;if the <code>i</code>-th item belongs to no group. The items and the groups are zero indexed. A group can have no item belonging to it.</p>
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Diff for: ‎problems/split-a-string-in-balanced-strings/README.md

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<!--|This file generated by command(leetcode description); DO NOT EDIT. |-->
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<!--+----------------------------------------------------------------------+-->
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<!--|@author openset <[email protected]> |-->
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<!--|@link https://github.com/openset |-->
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<!--|@home https://github.com/openset/leetcode |-->
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<!--+----------------------------------------------------------------------+-->
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[< Previous](https://github.com/openset/leetcode/tree/master/problems/count-vowels-permutation "Count Vowels Permutation")
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[Next >](https://github.com/openset/leetcode/tree/master/problems/queens-that-can-attack-the-king "Queens That Can Attack the King")
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## [1221. Split a String in Balanced Strings (Easy)](https://leetcode.com/problems/split-a-string-in-balanced-strings "分割平衡字符串")
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<p><i data-stringify-type="italic">Balanced</i>&nbsp;strings are those who have equal quantity of &#39;L&#39; and &#39;R&#39; characters.</p>
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<p>Given a balanced string&nbsp;<code data-stringify-type="code">s</code>&nbsp;split it in the maximum amount of balanced strings.</p>
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<p>Return the maximum amount of splitted balanced strings.</p>
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<p>&nbsp;</p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = &quot;RLRRLLRLRL&quot;
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<strong>Output:</strong> 4
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<strong>Explanation: </strong>s can be split into &quot;RL&quot;, &quot;RRLL&quot;, &quot;RL&quot;, &quot;RL&quot;, each substring contains same number of &#39;L&#39; and &#39;R&#39;.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = &quot;RLLLLRRRLR&quot;
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<strong>Output:</strong> 3
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<strong>Explanation: </strong>s can be split into &quot;RL&quot;, &quot;LLLRRR&quot;, &quot;LR&quot;, each substring contains same number of &#39;L&#39; and &#39;R&#39;.
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> s = &quot;LLLLRRRR&quot;
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<strong>Output:</strong> 1
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<strong>Explanation: </strong>s can be split into &quot;LLLLRRRR&quot;.
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</pre>
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<p>&nbsp;</p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 &lt;= s.length &lt;= 1000</code></li>
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<li><code>s[i] = &#39;L&#39; or &#39;R&#39;</code></li>
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</ul>
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### Related Topics
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[[Greedy](https://github.com/openset/leetcode/tree/master/tag/greedy/README.md)]
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[[String](https://github.com/openset/leetcode/tree/master/tag/string/README.md)]
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### Hints
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<details>
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<summary>Hint 1</summary>
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Loop from left to right maintaining a balance variable when it gets an L increase it by one otherwise decrease it by one.
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</details>
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<details>
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<summary>Hint 2</summary>
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Whenever the balance variable reaches zero then we increase the answer by one.
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</details>

Diff for: ‎problems/ugly-number-iii/README.md

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[Next >](https://github.com/openset/leetcode/tree/master/problems/smallest-string-with-swaps "Smallest String With Swaps")
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## [1201. Ugly Number III (Medium)](https://leetcode.com/problems/ugly-number-iii "")
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## [1201. Ugly Number III (Medium)](https://leetcode.com/problems/ugly-number-iii "丑数 III")
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<p>Write a program to find the&nbsp;<code>n</code>-th ugly number.</p>
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[[Math](https://github.com/openset/leetcode/tree/master/tag/math/README.md)]
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[[Binary Search](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)]
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### Similar Questions
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1. [Ugly Number II](https://github.com/openset/leetcode/tree/master/problems/ugly-number-ii) (Medium)
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### Hints
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<details>
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<summary>Hint 1</summary>

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