Merge pull request #1144 from 0xff-dev/2379

Add solution and test-cases for problem 2379

Author: 6boris

leetcode/2301-2400/2379.Minimum-Recolors-to-Get-K-Consecutive-Black-Blocks/README.md

@@ -1,28 +1,35 @@
 # [2379.Minimum Recolors to Get K Consecutive Black Blocks][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+You are given a **0-indexed** string `blocks` of length `n`, where `blocks[i]` is either `'W'` or `'B'`, representing the color of the `ith` block. The characters `'W'` and `'B'` denote the colors white and black, respectively.
+
+You are also given an integer `k`, which is the desired number of **consecutive** black blocks.
+
+In one operation, you can **recolor** a white block such that it becomes a black block.
+
+Return the **minimum** number of operations needed such that there is at least **one** occurrence of `k` consecutive black blocks.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: blocks = "WBBWWBBWBW", k = 7
+Output: 3
+Explanation:
+One way to achieve 7 consecutive black blocks is to recolor the 0th, 3rd, and 4th blocks
+so that blocks = "BBBBBBBWBW". 
+It can be shown that there is no way to achieve 7 consecutive black blocks in less than 3 operations.
+Therefore, we return 3.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Minimum Recolors to Get K Consecutive Black Blocks
-```go
 ```
-
+Input: blocks = "WBWBBBW", k = 2
+Output: 0
+Explanation:
+No changes need to be made, since 2 consecutive black blocks already exist.
+Therefore, we return 0.
+```
 
 ## 结语
 

leetcode/2301-2400/2379.Minimum-Recolors-to-Get-K-Consecutive-Black-Blocks/Solution.go

@@ -1,5 +1,30 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(blocks string, k int) int {
+	w, b := 0, 0
+	for i := 0; i < k; i++ {
+		if blocks[i] == 'W' {
+			w++
+			continue
+		}
+		b++
+	}
+	ans := w
+	start, end := 0, k
+	for ; end < len(blocks); end++ {
+		if blocks[end] == 'W' {
+			w++
+		} else {
+			b++
+		}
+		if blocks[start] == 'W' {
+			w--
+		} else {
+			b--
+		}
+		ans = min(ans, w)
+		start++
+	}
+	return ans
+
 }

leetcode/2301-2400/2379.Minimum-Recolors-to-Get-K-Consecutive-Black-Blocks/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		blocks string
+		k      int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "WBBWWBBWBW", 7, 3},
+		{"TestCase2", "WBWBBBW", 2, 0},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.blocks, c.k)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.blocks, c.k)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }