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solution.js
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solution.js
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/**
* @param {number[]} nums
* @param {number} target
* @return {number}
*/
var threeSumClosest = function (nums, target) {
// 就是变形的3sum
nums.sort((a, b) => a - b);
let index1 = 0;
let minDiff = Infinity;
let cloestVal = null;
while (index1 < nums.length - 2) {
let index2 = index1 + 1;
let index3 = nums.length - 1;
while (index2 < index3) {
const sum = nums[index1] + nums[index2] + nums[index3];
if (sum === target) {
return sum;
} else if (sum > target) {
const diff = sum - target;
if (diff < minDiff) {
minDiff = diff;
cloestVal = sum;
}
index3--;
} else {
const diff = target - sum;
if (diff < minDiff) {
minDiff = diff;
cloestVal = sum;
}
index2++;
}
}
index1++;
}
return cloestVal;
};