leetcode/typescript/15-3Sum.ts at main · remenraj/leetcode · GitHub

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function threeSum(nums: number[]): number[][] {
    const res: number[][] = [];
    nums = nums.sort((a, b) => a - b);

    for (let i = 0; i < nums.length; i++) {
        if (i > 0 && nums[i] == nums[i - 1]) {
            continue;
        }

        let l = i + 1;
        let r = nums.length - 1;
        while (l < r) {
            let sum = nums[i] + nums[l] + nums[r];

            if (sum > 0) {
                r -= 1;
            } else if (sum < 0) {
                l += 1;
            } else {
                res.push([nums[i], nums[l], nums[r]]);
                l += 1;
                while (nums[l] == nums[l - 1] && l < r) {
                    l += 1;
                }
            }
        }
    }
    return res;
}