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hsskey.js
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40 lines (29 loc) · 999 Bytes
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/**
* @param {number[]} nums
* @return {number[][]}
*/
var threeSum = function(nums) {
const result = [];
const n = nums.length;
if (n < 3) return result;
nums.sort((a, b) => a - b);
const uniqueTriplets = new Set();
for (let i = 0; i < n - 2; i++) {
if (nums[i] > 0) break;
if (i > 0 && nums[i] === nums[i - 1]) continue;
const target = -nums[i];
const seen = new Set();
for (let j = i + 1; j < n; j++) {
const complement = target - nums[j];
if (seen.has(complement)) {
const triplet = [nums[i], complement, nums[j]].toString();
if (!uniqueTriplets.has(triplet)) {
uniqueTriplets.add(triplet);
result.push([nums[i], complement, nums[j]]);
}
}
seen.add(nums[j]);
}
}
return result;
};