add: leetcode 0997 solution

leetcode/0997.Find-the-Town-Judge/997.Find the Town Judge.go

@@ -0,0 +1,22 @@
+package leetcode
+
+func findJudge(n int, trust [][]int) int {
+	if n == 1 && len(trust) == 0 {
+		return 1
+	}
+	judges := make(map[int]int)
+	for _, v := range trust {
+		judges[v[1]] += 1
+	}
+	for _, v := range trust {
+		if _, ok := judges[v[0]]; ok {
+			delete(judges, v[0])
+		}
+	}
+	for k, v := range judges {
+		if v == n-1 {
+			return k
+		}
+	}
+	return -1
+}