Add solution and test-cases for problem 1653

leetcode/1601-1700/1653.Minimum-Deletions-to-Make-String-Balanced/README.md

@@ -1,28 +1,29 @@
 # [1653.Minimum Deletions to Make String Balanced][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 string `s` consisting only of characters `'a'` and `'b'`.
+
+You can delete any number of characters in `s` to make `s` **balanced**. `s` is **balanced** if there is no pair of indices `(i,j)` such that `i < j` and `s[i] = 'b'` and `s[j]= 'a'`.
+
+Return the **minimum** number of deletions needed to make `s` **balanced**.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: s = "aababbab"
+Output: 2
+Explanation: You can either:
+Delete the characters at 0-indexed positions 2 and 6 ("aababbab" -> "aaabbb"), or
+Delete the characters at 0-indexed positions 3 and 6 ("aababbab" -> "aabbbb").
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Minimum Deletions to Make String Balanced
-```go
 ```
-
+Input: s = "bbaaaaabb"
+Output: 2
+Explanation: The only solution is to delete the first two characters.
+```
 
 ## 结语
 

leetcode/1601-1700/1653.Minimum-Deletions-to-Make-String-Balanced/Solution.go

@@ -1,5 +1,27 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "math"
+
+func Solution(s string) int {
+	l := len(s)
+	ac, bc := make([]int, l), make([]int, l)
+	b := 0
+	for i := 0; i < l; i++ {
+		if s[i] == 'b' {
+			b++
+		}
+		bc[i] = b
+	}
+	a := 0
+	for i := l - 1; i >= 0; i-- {
+		if s[i] == 'a' {
+			a++
+		}
+		ac[i] = a
+	}
+	ans := math.MaxInt
+	for i := 0; i < l; i++ {
+		ans = min(ans, ac[i]+bc[i])
+	}
+	return ans - 1
 }

leetcode/1601-1700/1653.Minimum-Deletions-to-Make-String-Balanced/Solution_test.go

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs string
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "aababbab", 2},
+		{"TestCase2", "bbaaaaabb", 2},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }