[BOJ] 14626 ISBN (B1)

Author: ShipFriend0516

서정우/8주차/260220.js

@@ -0,0 +1,30 @@
+const fs = require("fs");
+const filePath =
+  process.platform === "linux" ? "/dev/stdin" : "./서정우/input.txt";
+const input = fs
+  .readFileSync(filePath)
+  .toString()
+  .trim()
+  .split("\n")
+  .map((el) => el.trim());
+
+const number = input[0];
+const numbers = number
+  .slice(0, -1)
+  .split("")
+  .map((el) => (Number.isNaN(Number(el)) ? el : Number(el)));
+const checkNumber = Number(number.at(-1));
+const starIndex = numbers.findIndex((el) => el === "*");
+
+const sum = numbers.reduce(
+  (acc, cur, idx) =>
+    Number.isInteger(cur) ? acc + cur * (idx % 2 === 0 ? 1 : 3) : acc,
+  0,
+);
+
+for (let i = 0; i < 10; i++) {
+  if ((sum + i * (starIndex % 2 === 0 ? 1 : 3) + checkNumber) % 10 === 0) {
+    console.log(i);
+    break;
+  }
+}

서정우/input.txt

@@ -1,2 +1 @@
-5
-300 400 500 400 300
+9788968322*73