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LeetCode(16) 3Sum Closest

class Solution {
public:
    int threeSumClosest(vector<int>& nums, int target) {

        sort(nums.begin(), nums.end());

        int differ;
        int length = nums.size();
        bool mark = true;
        for(int i = 0; i < length - 2; i++) {

            int secondTarget = target - nums[i];
            int
start = i + 1; int end = length - 1; for(; start < end; ) { if(mark) { differ = nums[start] + nums[end] - secondTarget; if(differ == 0) break; mark = false; if
(nums[start] + nums[end] - secondTarget < 0) start++; if(nums[start] + nums[end] - secondTarget > 0) end--; }else { if(abs(nums[start] + nums[end] - secondTarget) < abs(differ)) differ = nums[start] + nums[end] - secondTarget; if
(differ == 0) break; if(nums[start] + nums[end] - secondTarget < 0) start++; if(nums[start] + nums[end] - secondTarget > 0) end--; } } if(differ == 0) break; } return target + differ; } };

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