Create 997_12

Week_03/id_12/997_12

@@ -0,0 +1,31 @@
+class Solution {
+
+    /**
+     * @param Integer $N
+     * @param Integer[][] $trust
+     * @return Integer
+     */
+    function findJudge($N, $trust) {
+        if(count($trust)==1){
+            return $trust[0][1];
+        }
+        if(count($trust)==0){
+            return 1;
+        }
+
+        $countArr = [];
+        foreach($trust as $key=>$val){
+            $countArr[$val[0]] = -1;
+            if($countArr[$val[1]] !=-1){
+                $countArr[$val[1]]++;
+            }
+        }
+
+        for($i=0;$i<=$N;$i++){
+           if($countArr[$i] == $N-1){
+                return $i;
+           }
+        }        
+        return -1;
+    }
+}