feat: 0074 Search a 2D Matrix

Author: kimi0230

Leetcode/0074.Search-a-2D-Matrix/README.md

@@ -0,0 +1,93 @@
+---
+title: 74. Search a 2D Matrix
+subtitle: "https://leetcode.com/problems/search-a-2d-matrix/description/"
+date: 2024-03-24T22:10:00+08:00
+lastmod: 2024-03-24T22:10:00+08:00
+draft: false
+author: "Kimi.Tsai"
+authorLink: "https://kimi0230.github.io/"
+description: "0074.Search-a-2D-Matrix"
+license: ""
+images: []
+
+tags: [LeetCode, Go, Medium, Search a 2D Matrix, Array, Binary Search, Matrix, Facebook, Amazon, Microsoft, Bloomberg]
+categories: [LeetCode]
+
+featuredImage: ""
+featuredImagePreview: ""
+
+hiddenFromHomePage: false
+hiddenFromSearch: false
+twemoji: false
+lightgallery: true
+ruby: true
+fraction: true
+fontawesome: true
+linkToMarkdown: false
+rssFullText: false
+
+toc:
+  enable: true
+  auto: true
+code:
+  copy: true
+  maxShownLines: 200
+math:
+  enable: false
+  # ...
+mapbox:
+  # ...
+share:
+  enable: true
+  # ...
+comment:
+  enable: true
+  # ...
+library:
+  css:
+    # someCSS = "some.css"
+    # located in "assets/"
+    # Or
+    # someCSS = "https://cdn.example.com/some.css"
+  js:
+    # someJS = "some.js"
+    # located in "assets/"
+    # Or
+    # someJS = "https://cdn.example.com/some.js"
+seo:
+  images: []
+  # ...
+---
+# [74. Search a 2D Matrix](https://leetcode.com/problems/search-a-2d-matrix/description/)
+
+## 題目
+
+## 題目大意
+編寫一個高效的演算法來判斷 m x n 矩陣中，是否存在一個目標值。 該矩陣具有如下特性：
+* 每行中的整數從左到右按升序排列。
+* 每行的第一个整数大于前一行的最后一个整数。
+
+## 解題思路
+可以將二維轉成一維矩陣
+
+## Big O
+
+* 時間複雜 : ``
+* 空間複雜 : ``
+
+## 來源
+* https://leetcode.com/problems/search-a-2d-matrix/description/
+* https://leetcode.cn/problems/
+
+## 解答
+https://github.com/kimi0230/LeetcodeGolang/blob/master/Leetcode/0074.Search-a-2D-Matrix/main.go
+
+```go
+
+```
+
+##  Benchmark
+
+```sh
+
+```

Leetcode/0074.Search-a-2D-Matrix/main.go

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+package searcha2dmatrix
+
+// 時間複雜 O(), 空間複雜 O()
+func searchMatrix(matrix [][]int, target int) bool {
+	m := len(matrix)
+	if m <= 0 {
+		return false
+	}
+	n := len(matrix[0])
+
+	left, right := 0, m*n-1
+	for left <= right {
+		mid := int(uint(right+left) >> 1) //left + (right-left)/2
+		val := getMatrix(matrix, mid)
+		if val == target {
+			return true
+		} else if val < target {
+			left = mid + 1
+		} else {
+			right = mid - 1
+		}
+	}
+	return false
+}
+
+// 將 mxn的二維陣列 映射成一維陣列
+func getMatrix(matrix [][]int, index int) int {
+	n := len(matrix[0])
+	i, j := index/n, index%n
+	return matrix[i][j]
+}

Leetcode/0074.Search-a-2D-Matrix/main_test.go

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+package searcha2dmatrix
+
+import "testing"
+
+var tests = []struct {
+	matrix [][]int
+	target int
+	want   bool
+}{
+	{
+		[][]int{
+			{1, 3, 5, 7},
+			{10, 11, 16, 20},
+			{23, 30, 34, 60},
+		},
+		3,
+		true,
+	},
+	{
+		[][]int{
+			{1, 3, 5, 7},
+			{10, 11, 16, 20},
+			{23, 30, 34, 60},
+		},
+		13,
+		false,
+	},
+	{
+		[][]int{},
+		5,
+		false,
+	},
+}
+
+func TestSearchMatrix(t *testing.T) {
+	for _, tt := range tests {
+		if got := searchMatrix(tt.matrix, tt.target); got != tt.want {
+			t.Errorf("searchMatrix(%v, %v) = %v, want %v", tt.matrix, tt.target, got, tt.want)
+		}
+	}
+}
+
+func BenchmarkSearchMatrix(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		searchMatrix(tests[0].matrix, tests[0].target)
+	}
+}

README.md

@@ -308,6 +308,7 @@ https://labuladong.gitee.io/algo/2/21/57/
 | [0142](https://kimi0230.github.io/LeetcodeGolang/Leetcode/0142.Linked-List-CycleII/)              |         [Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/)          |       [Go](https://github.com/kimi0230/LeetcodeGolang/tree/master/Leetcode/0142.Linked-List-CycleII)        | Medium     | O(n) | O(1)  | Linked List, Two Pointers |
 | [0344](https://kimi0230.github.io/LeetcodeGolang/Leetcode/0344.Reverse-String/)                   |               [Reverse String](https://leetcode.com/problems/reverse-string/)                |          [Go](https://github.com/kimi0230/LeetcodeGolang/tree/master/Leetcode/0344.Reverse-String)          | Easy       | O(n) | O(1)  | Two Pointers              |
 | [0876](https://kimi0230.github.io/LeetcodeGolang/Leetcode/0876.Middle-of-the-Linked-List/)        |    [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/)     |    [Go](https://github.com/kimi0230/LeetcodeGolang/tree/master/Leetcode/0876.Middle-of-the-Linked-List)     | Easy       |      |       | Linked List, Two Pointers |
+| [0074](https://kimi0230.github.io/LeetcodeGolang/Leetcode/0074.Search-a-2D-Matrix/)        |    [Search a 2D Matrix](https://leetcode.com/problems/search-a-2d-matrix/)     |    [Go](https://github.com/kimi0230/LeetcodeGolang/tree/master/Leetcode/0074.Search-a-2D-Matrix)     | Medium       |      |       |  Binary Search, Two Pointers |
 
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