Sep 10, 2024 · Sep 2, 2024 · Sep 2, 2024 · Sep 9, 2024 · Sep 9, 2024 · Sep 10, 2024
diff --git a/problems/kamacoder/0058.区间和.md b/problems/kamacoder/0058.区间和.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -263,3 +263,52 @@ if __name__ == "__main__":
		main()

		```

	### JavaScript

	``` JavaScript

	function prefixSum() {
	const readline = require('readline');

	const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout
	});

	let inputLines = [];
	rl.on('line', (line) => {
	inputLines.push(line.trim());
	});

	rl.on('close', () => {
	// 读取项数 n
	const n = parseInt(inputLines[0]);

	// 使用前缀和,复杂度控制在 O(1)
	let sum = new Array(n);
	sum[0] = parseInt(inputLines[1]);

	// 计算前缀和数组
	for (let i = 1; i < n; i++) {
	let value = parseInt(inputLines[i + 1]);
	sum[i] = sum[i - 1] + value;
	}

	// 处理区间和查询
	for (let i = n + 1; i < inputLines.length; i++) {
	let [left, right] = inputLines[i].split(' ').map(Number);

	if (left === 0) {
	console.log(sum[right]);
	} else {
	console.log(sum[right] - sum[left - 1]);
	}
	}
	});
	}


	```