[LeetCode] 16. 3Sum Closest about leetcode HOT 3 OPEN

可以优化一下， 当nums[i] *3 > target 的时候直接return nums[i]+nums[i+1]+nums[i+2] 和当前closest中最接近的那个

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已添加，多谢指出～

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if (nums[i] * 3 > target) return min(closest, nums[i] + nums[i + 1] + nums[i + 2]);
should be like this:
if (nums[i] * 3 > target) {
total = nums[i] + nums[i + 1] + nums[i + 2];
if (abs(total-target) < diff) { return total;}
else{return closest}
}

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