3Sum leetcode算法

Question

我遇到3sum算法的以下输入问题。我 获得

  

超出时间限制

我的算法对于此输入是否太慢，有任何建议如何改进它？

原始的leetcode问题：

  

给定n个整数的数组nums，nums中是否有元素a，b，c，a + b + c = 0？找到数组中所有唯一的三元组，它们总和为零。

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;
};

Answer 1

我使用双指针方法修改了您的解决方案，现在代码通过了所有测试用例。以下算法的总运行时复杂度为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;
}

该解决方案击败了近98％的JavaScript提交