编辑代码

function divideToSquare(length, width) {
    while (width !== 0) {
        const temp = width;
        width = length % width;
        length = temp;
    }
    return length;
}

function recursiveSum(arr, start, end) {
    if (start === end) {
        return arr[start];
    }
    const mid = Math.floor((start + end) / 2);
    const leftSum = recursiveSum(arr, start, mid);
    const rightSum = recursiveSum(arr, mid + 1, end);
    return leftSum + rightSum;
}


function iterativeSum(arr) {
    let sum = 0;
    for (let i = 0; i < arr.length; i++) {
        sum += arr[i];
    }
    return sum;
}


console.log(divideToSquare(1680, 640));

const arr1 = [1, 2, 3, 4, 5];
const sum1 = recursiveSum(arr1, 0, arr1.length - 1);
console.log(sum1);


const arr2 = [1, 2, 3, 4, 5];
const sum2 = iterativeSum(arr2);
console.log(sum2);