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// 给定 nums = [2, 7, 11, 15], target = 9

// 因为 nums[0] + nums[1] = 2 + 7 = 9
// 所以返回 [0, 1]

function towSum(nums, target) {
    nums.sort();
    let l = 0, r = nums.length - 1;
    var str = "";
    while(l <= r) {
        if(nums[l] + nums[r] == target) {
            str = "["+l + "," + r+"]";
            break;
        } else if(nums[l] + nums[r] < target) {
            l++;
        } else {
            r --;
        }
    }
    return str;
}

const nums = [1, 2, 3, 4, 5, 6];
const target = 11;
console.log(towSum(nums, target));