###
Problem

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.

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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).

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JavaScript Code

function threeSumClosest(num, target) {
var min = 9007199254740992;
var result = 0;
num.sort();
for (var i = 0; i < num.length; i++) {
var j = i + 1;
var k = num.length - 1;
while (j < k) {
var sum = num[i] + num[j] + num[k];
var diff = Math.abs(sum - target);
if(diff == 0) return 0;
if (diff < min) {
min = diff;
result = sum;
}
if (sum <= target) {
j++;
} else {
k--;
}
}
}
return result;
}
console.log(threeSumClosest([-1,2,1,-4], 1));

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