Add solution and test-cases for problem 1400

Author: 0xff-dev

leetcode/1301-1400/1400.Construct-K-Palindrome-Strings/README.md

@@ -0,0 +1,36 @@
+# [1400.Construct K Palindrome Strings][title]
+
+## Description
+Given a string `s` and an integer `k`, return `true` if you can use all the characters in `s` to construct `k` palindrome strings or `false` otherwise.
+
+**Example 1:**
+
+```
+Input: s = "annabelle", k = 2
+Output: true
+Explanation: You can construct two palindromes using all characters in s.
+Some possible constructions "anna" + "elble", "anbna" + "elle", "anellena" + "b"
+```
+
+**Example 2:**
+
+```
+Input: s = "leetcode", k = 3
+Output: false
+Explanation: It is impossible to construct 3 palindromes using all the characters of s.
+```
+
+**Example 3:**
+
+```
+Input: s = "true", k = 4
+Output: true
+Explanation: The only possible solution is to put each character in a separate string.
+```
+
+## 结语
+
+如果你同我一样热爱数据结构、算法、LeetCode，可以关注我 GitHub 上的 LeetCode 题解：[awesome-golang-algorithm][me]
+
+[title]: https://leetcode.com/problems/construct-k-palindrome-strings/
+[me]: https://github.com/kylesliu/awesome-golang-algorithm

leetcode/1301-1400/1400.Construct-K-Palindrome-Strings/Solution.go

@@ -1,5 +1,28 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(s string, k int) bool {
+	if len(s) < k {
+		return false
+	}
+	count := [26]int{}
+	for _, b := range s {
+		count[b-'a']++
+	}
+	odd, even := 0, 0
+	for _, n := range count {
+		if n == 0 {
+			continue
+		}
+		even += n
+		if n&1 == 1 {
+			odd++
+		}
+	}
+	if odd > k {
+		return false
+	}
+	if k == odd {
+		return true
+	}
+	return k <= even
 }

leetcode/1301-1400/1400.Construct-K-Palindrome-Strings/Solution_test.go

@@ -10,30 +10,31 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
+		s      string
+		k      int
 		expect bool
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", "annabelle", 2, true},
+		{"TestCase2", "leetcode", 3, false},
+		{"TestCase3", "true", 4, true},
 	}
 
 	//	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.s, 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.s, 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() {
 }