not finish runner / 以�

Author: JustDevRae

JustDevRae/Hash/not_finish_runner.js

@@ -0,0 +1,21 @@
+function solution(participant, completion) {
+  const obj = {};
+
+  for (const p of participant) {
+    if (obj[p]) {
+      obj[p] += 1;
+    } else {
+      obj[p] = 1;
+    }
+  }
+
+  for (const c of completion) {
+    obj[c] -= 1;
+  }
+
+  for (const key in obj) {
+    if (obj[key] > 0) {
+      return key;
+    }
+  }
+}