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javascript - 3Sum leetcode算法

转载 作者:塔克拉玛干 更新时间:2023-11-03 04:04:32 25 4
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我在处理 3sum 算法的以下输入时遇到问题。我是得到

Time Limit Exceeded

我的算法对于这个输入是否太慢了,有什么改进的建议吗?

leetcode 原题:

Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.

let data = 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var threeSum = function(nums) {
var solutions = [];
var target = 0;
nums.sort(function(a, b) {
return a - b;
});
console.log('sorted array ',nums);
for(var i = 0; i < nums.length - 1 && nums[i] <= 0; i++) {
if(nums[i] === nums[i - 1]) continue; // continue means skip
var hash = {};
for(var j = i + 1; j < nums.length; j++) {
if(hash[target - nums[i] - nums[j]] === undefined){
hash[nums[j]] = 1;
}else{
hash[target - nums[i] - nums[j]]++;
if(hash[target - nums[i] - nums[j]] > 2){

}else{
solutions.push([nums[i], target - nums[i] - nums[j], nums[j]]);
}
}
}
console.log(hash);
console.log("____________________________")
}
return solutions;
};

最佳答案

我已经使用两点法修改了您的解决方案,代码现在通过了所有测试用例。以下算法的总体运行时复杂度为 O(n^2)

var threeSum = function(nums) {
var solutions = [];
var target = 0;
nums.sort(function(a, b) {
return a - b;
});
for(var i = 0; i < nums.length - 2; i++) {
if(i === 0 || (i > 0 && nums[i] !== nums[i - 1])) {
var lo = i + 1;
var hi = nums.length - 1;
var sum = - nums[i];
while(lo < hi) {
if(nums[lo] + nums[hi] === sum) {
solutions.push([nums[i],nums[lo],nums[hi]]);
while (lo < hi && nums[lo] === nums[lo + 1]) lo++;
while (lo < hi && nums[hi] == nums[hi-1]) hi--;
lo++; hi--;
}else if (nums[lo] + nums[hi] > sum) {
hi--;
}else {
lo++;
}
}
}
};
return solutions;
}

而且该解决方案击败了几乎 98% 的 JavaScript 提交 enter image description here

关于javascript - 3Sum leetcode算法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50122096/

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