leetcode16--最接近的三数之和

1. 题意

求最接近的三数之和
最接近的三数之和

2. 题解

与三数之和类似

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

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

        int sz = nums.size();

        int sum = nums[0] + nums[1] + nums[2];


        for (int i = 0;i < sz; ++i) {
            int lp = i + 1;
            int rp = sz - 1;
    
            if ( i && nums[i - 1] == nums[i])
                continue;

            int tot ;
            while (lp < rp) {
                tot = nums[i];
                tot += nums[lp] + nums[rp];

                if ( abs( tot - target) < abs(sum - target))
                    sum = tot;

                if ( tot < target) {
                    ++lp;
                }
                else {
                    --rp;
                }
            }
        }

        return sum;
    }
};