day 7

Author: sachuverma

Leetcode Daily Challenge/August-2021/07. Palindrome Partitioning II.cpp

@@ -0,0 +1,57 @@
+/*
+Palindrome Partitioning II
+==========================
+
+Given a string s, partition s such that every substring of the partition is a palindrome.
+
+Return the minimum cuts needed for a palindrome partitioning of s.
+
+Example 1:
+Input: s = "aab"
+Output: 1
+Explanation: The palindrome partitioning ["aa","b"] could be produced using 1 cut.
+
+Example 2:
+Input: s = "a"
+Output: 0
+
+Example 3:
+Input: s = "ab"
+Output: 1
+ 
+Constraints:
+1 <= s.length <= 2000
+s consists of lower-case English letters only.
+*/
+
+class Solution {
+public:
+    vector<int> memo;
+    
+    bool palendrome(string& s, int i, int j) {
+        while(i < j) {
+            if(s[i++] != s[j--]) return false;
+        }    
+        return true;
+    }
+    
+    int dfs(int i, string& s) {
+        if(i == s.size()) return 0;
+        
+        if(memo[i] != -1) return memo[i];
+        
+        int ans = s.size();
+        for(int j = i; j < s.size(); ++j) {
+            if(palendrome(s, i, j)) {
+                ans = min(ans, 1 + dfs(j+1, s));
+            }
+        }
+        
+        return memo[i] = ans;
+    }
+    
+    int minCut(string s) {
+        memo = vector<int> (s.size()+1, -1);
+        return dfs(0, s) - 1;
+    }
+};

Leetcode Daily Challenge/August-2021/README.md

@@ -8,3 +8,4 @@
 | 4.  | [Path Sum II](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge-2021/613/week-1-august-1st-august-7th/3838/)           |       [cpp](./04.%20Path%20Sum%20II.cpp)       |
 | 5.  | [Stone Game](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge-2021/613/week-1-august-1st-august-7th/3870/)           |       [cpp](./05.%20Stone%20Game.cpp)       |
 | 6.  | [N-ary Tree Level Order Traversal](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge-2021/613/week-1-august-1st-august-7th/3871/)           |       [cpp](./06.%20N-ary%20Tree%20Level%20Order%20Traversal.cpp)       |
+| 7.  | [Palindrome Partitioning II](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge-2021/613/week-1-august-1st-august-7th/3872/)           |       [cpp](./07.%20Palindrome%20Partitioning%20II.cpp)       |