规范格式

leetcode/0447.Number-of-Boomerangs/447. Number of Boomerangs.go

@@ -0,0 +1,21 @@
+package leetcode
+
+func numberOfBoomerangs(points [][]int) int {
+	res := 0
+	for i := 0; i < len(points); i++ {
+		record := make(map[int]int, len(points))
+		for j := 0; j < len(points); j++ {
+			if j != i {
+				record[dis(points[i], points[j])]++
+			}
+		}
+		for _, r := range record {
+			res += r * (r - 1)
+		}
+	}
+	return res
+}
+
+func dis(pa, pb []int) int {
+	return (pa[0]-pb[0])*(pa[0]-pb[0]) + (pa[1]-pb[1])*(pa[1]-pb[1])
+}