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whewchews.ts
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33 lines (28 loc) ยท 773 Bytes
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function threeSum(nums: number[]): number[][] {
let result: [number, number, number][] = [];
const TARGET = 0;
// TC: O(NlogN)
nums.sort((a, b) => a - b);
for (let i = 0; i < nums.length - 2; i++) {
if (i > 0 && nums[i] === nums[i - 1]) continue;
let left = i + 1;
let right = nums.length - 1;
while (left < right) {
let sum = nums[i] + nums[left] + nums[right];
if (sum === TARGET) {
result.push([nums[i], nums[left], nums[right]]);
while (nums[left] === nums[left + 1]) left++;
while (nums[right] === nums[right - 1]) right--;
left++;
right--;
} else if (sum < TARGET) {
left++;
} else {
right--;
}
}
}
return result;
}
// TC: O(n^2)
// SC: O(n)