init commit

archive/algorithm/leetcode/611.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+)
+
+func triangleNumber(nums []int) int {
+	sort.Sort(sort.IntSlice(nums))
+	ret := 0
+	for i := range nums {
+		i2 := len(nums) - 2
+		if i2 > i {
+			num := nums[i] + nums[i2]
+			for i3 := len(nums) - 1; i3 > i2; i3-- {
+				if num > nums[i3] {
+					ret += (i3 - i2) + (i2 - i - 1)
+					break
+				}
+			}
+		}
+
+	}
+	return ret
+}
+
+func main() {
+	fmt.Println(triangleNumber([]int{2, 3, 4, 4})) //4
+
+	fmt.Println(triangleNumber([]int{2, 2, 3, 4})) //3
+}