js lang solution №3

js/solution3.js

@@ -0,0 +1,65 @@
+function tenToBin(x) {
+  const l = [];
+  while (x !== 0) {
+    l.push(x % 2);
+    x = Math.trunc(x / 2);
+  }
+  return l;
+}
+
+function calculateSum(numbers, mask) {
+  let x = 0;
+  for (let i = 0; i < mask.length; i++) {
+    if (mask[i] == 1) {
+      x = x + numbers[i];
+    }
+  }
+  return x
+}
+
+function findSum(target, numbers) {
+  const n = numbers.length;
+  const totalCombinations = (1 << n) - 1;
+
+  for (let mask = 0; mask < totalCombinations; mask++) {
+    let currentSum = 0;
+    for (let i = 0; i < n; i++) {
+      // Проверяем i-й бит числа mask
+      currentSum += (mask >> (i + 0) & 1) * numbers[i];
+    }
+    if (currentSum == target) {
+      return tenToBin(mask);
+    }
+  }
+  return [];
+}
+
+function main() {
+  const args = process.argv.slice(2);
+
+  // 1. Валидация
+  if (args.length < 5) {
+    console.log("ER: input parameters");
+    process.exit(1);
+  }
+
+  if (args.length > 30) {
+    console.log("ER: input parameters");
+    process.exit(1);
+  }
+
+  // 2. Формирование данных
+  const target = parseInt(args[0], 10);
+  const numbers = new Int32Array(args.slice(1).map(Number));
+
+  // 3. Запуск поиска
+  const result = findSum(target, numbers);
+
+  if (result.length) {
+    console.log("OK: ", result.join(''));
+  } else {
+    console.log("NO: not found.")
+  }
+}
+
+main();