function threeSum(nums: number[]): number[][] {
const list: number[][] = [];
const length = nums.length;
for(let i = 0; i < length - 2; i++) {
for(let j = i + 1; j < length - 1; j++) {
for(let k = j + 1; k < length; k++) {
if(nums[i] + nums[j] + nums[k] === 0) {
let flag = true;
for(let item of list) {
if(item.sort().toString() === [nums[i], nums[j], nums[k]].sort().toString()) {
flag = false;
break;
}
}
if(flag) {
list.push([nums[i], nums[j], nums[k]]);
}
}
}
}
}
return list;
};
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