Add solution and test-cases for problem 757

Author: 0xff-dev

leetcode/701-800/0757.Set-Intersection-Size-At-Least-Two/README.md

@@ -1,28 +1,40 @@
 # [757.Set Intersection Size At Least Two][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 2D integer array `intervals` where `intervals[i] = [starti, endi]` represents all the integers from `starti` to `endi` inclusively.
+
+A **containing set** is an array `nums` where each interval from `intervals` has **at least two** integers in `nums`.
+
+- For example, if `intervals = [[1,3], [3,7], [8,9]]`, then `[1,2,4,7,8,9]` and `[2,3,4,8,9]` are **containing sets**.
+
+Return the minimum possible size of a containing set.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: intervals = [[1,3],[3,7],[8,9]]
+Output: 5
+Explanation: let nums = [2, 3, 4, 8, 9].
+It can be shown that there cannot be any containing array of size 4.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Set Intersection Size At Least Two
-```go
 ```
+Input: intervals = [[1,3],[1,4],[2,5],[3,5]]
+Output: 3
+Explanation: let nums = [2, 3, 4].
+It can be shown that there cannot be any containing array of size 2.
+```
+
+**Example 3:**
 
+```
+Input: intervals = [[1,2],[2,3],[2,4],[4,5]]
+Output: 5
+Explanation: let nums = [1, 2, 3, 4, 5].
+It can be shown that there cannot be any containing array of size 4.
+```
 
 ## 结语
 

leetcode/701-800/0757.Set-Intersection-Size-At-Least-Two/Solution.go

@@ -1,5 +1,35 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "sort"
+
+func Solution(intervals [][]int) int {
+	n := len(intervals)
+	sort.Slice(intervals, func(i, j int) bool {
+		a, b := intervals[i], intervals[j]
+		if a[0] == b[0] {
+			return a[1] > b[1]
+		}
+		return a[0] < b[0]
+	})
+
+	todo := make([]int, n)
+	for i := 0; i < n; i++ {
+		todo[i] = 2
+	}
+
+	ans := 0
+	t := n
+	for t--; t >= 0; t-- {
+		s := intervals[t][0]
+		m := todo[t]
+		for p := s; p < s+m; p++ {
+			for i := 0; i <= t; i++ {
+				if todo[i] > 0 && p <= intervals[i][1] {
+					todo[i]--
+				}
+			}
+			ans++
+		}
+	}
+	return ans
 }

leetcode/701-800/0757.Set-Intersection-Size-At-Least-Two/Solution_test.go

@@ -10,12 +10,12 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs [][]int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", [][]int{{1, 3}, {3, 7}, {8, 9}}, 5},
+		{"TestCase2", [][]int{{1, 3}, {1, 4}, {2, 5}, {3, 5}}, 3},
+		{"TestCase3", [][]int{{1, 2}, {2, 3}, {2, 4}, {4, 5}}, 5},
 	}
 
 	//	开始测试
@@ -30,10 +30,10 @@ 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() {
 }