15. 三数之和
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class Solution {
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class Solution {
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public:
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public:
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vector<vector<int>> threeSum(vector<int>& nums) {
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vector<vector<int>> threeSum(vector<int>& nums) {
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// <EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȥ<EFBFBD>ظ<EFBFBD>
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// The main issue is to remove duplicate answers
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int n = nums.size();
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int n = nums.size();
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sort(nums.begin(), nums.end());
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sort(nums.begin(), nums.end());
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vector<vector<int>> ret;
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vector<vector<int>> ret;
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