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3Sum Closest
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution.
For example, given array S = {-1 2 1 -4}, and target = 1. The sum that is closest to the target is 2. (-1 + 2 + 1 = 2). Java代码： public class Solution { public int threeSumClosest(int[] num, int target) { int result = num[0] + num[1] + num[num.length - 1]; Arrays.sort(num); for (int i = 0; i < num.length - 2; i++) { int start = i + 1, end = num.length - 1; while (start < end) { int sum = num[i] + num[start] + num[end]; if (sum > target) { end--; } else { start++; } if (Math.abs(sum - target) < Math.abs(result - target)) { result = sum; } } } return result; }} 转载地址：http://rnuni.baihongyu.com/