:add (programmers level 1): js 풀이

programmers/level1/완주하지 못한 선수.js

@@ -0,0 +1,20 @@
+function solution(participant, completion) {
+  const map = new Map()
+  let result = ''
+
+  participant.forEach(player => {
+    map.set(player, (map.get(player) || 0) + 1)
+  })
+
+  completion.forEach(player => {
+    map.set(player, map.get(player) - 1)
+  })
+
+  for (const [key, value] of map.entries()) {
+    if (value === 1) {
+      result = key
+    }
+  }
+
+  return result
+}

programmers/level1/폰켓몬.js

@@ -0,0 +1,9 @@
+function solution(nums) {
+  const ponkemon = [...new Set(nums)]
+
+  if (nums.length / 2 < ponkemon.length) {
+    return nums.length / 2
+  } else {
+    return ponkemon.length
+  }
+}