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function fourSum(nums: number[], target: number): number[][] {    nums.sort((a, b) => a - b);    const ans: number[][] = [];    for (let i = 0; i < nums.length; i++) {        if (i > 0 && nums[i] === nums[i - 1]) {            continue;        }        for (let j = i + 1; j < nums.length; j++) {            if (j > i + 1 && nums[j] === nums[j - 1]) {                continue;            }            let left: number = j + 1;            let right: number = nums.length - 1;            while (left < right) {                const res: number = nums[i] + nums[j] + nums[left] +                    nums[right];                if (res > target) {                    right--;                } else if (res < target) {                    left++;                } else {                    ans.push([nums[i], nums[j], nums[left], nums[right]]);                    left++;                    right--;                    while (left < right && nums[left] === nums[left - 1]) {                        left++;                    }                    while (left < right && nums[right] === nums[right + 1]) {                        right--;                    }                }            }        }    }    return ans;}
export default fourSum;