[BOJ] 27111 출입 기록 (S5)

Author: ShipFriend0516

서정우/5주차/260129.js

@@ -0,0 +1,31 @@
+const fs = require("fs");
+const filePath = process.platform === "linux" ? "/dev/stdin" : "./서정우/input.txt";
+const input = fs.readFileSync(filePath).toString().trim().split("\n");
+
+const lines = input.slice(1);
+const lastMoveMap = {};
+let missed = 0;
+
+lines.forEach((line) => {
+  const [id, action] = line.split(" ").map(Number);
+  const move = action === 0 ? -1 : 1;
+  if (lastMoveMap[id]) {
+    if (lastMoveMap[id] === move) {
+      missed++;
+    }
+    lastMoveMap[id] = move;
+  } else {
+    if (move === -1) {
+      missed++;
+    }
+    lastMoveMap[id] = move;
+  }
+});
+
+for (const id in lastMoveMap) {
+  if (lastMoveMap[id] === 1) {
+    missed++;
+  }
+}
+
+console.log(missed);

서정우/input.txt

@@ -1,5 +1,9 @@
-5 4 20
-1 2 3
-3 4 8
-2 3 12
-4 5 12
+8
+1 1
+2 1
+1 1
+4 1
+3 0
+5 1
+4 0
+1 0