Simple Java Beats 90%


  • 0
    Z
    public class Solution {
    public List<List<Integer>> fourSum(int[] nums, int target) {
        if(nums.length<4) return new ArrayList<List<Integer>>();
        List<List<Integer>> result=new ArrayList<List<Integer>>();
        Arrays.sort(nums);
        int l,r,sum;
        int length=nums.length;
        for(int i=0;i<length-3;i++){
            if(i>0 && nums[i]==nums[i-1]) continue;
            if(nums[i]+nums[i+1]+nums[i+2]+nums[i+3]>target) break;
            if(nums[i]+nums[length-1]+nums[length-2]+nums[length-3]<target) continue;
            for(int j=length-1;j>i+2;j--){
                if(j<nums.length-1 && nums[j]==nums[j+1]) continue;
                if(nums[i]+nums[j]+nums[i+1]+nums[i+2]>target) continue;
                if(nums[i]+nums[j]+nums[j-1]+nums[j-2]<target) break;
                l=i+1;
                r=j-1;
                while(l<r){
                    sum=nums[i]+nums[j]+nums[l]+nums[r];
                    if(sum==target){
                        result.add(Arrays.asList(nums[i],nums[l],nums[r],nums[j]));
                        while(++l<r && nums[l]==nums[l-1]);
                        while(--r>l && nums[r]==nums[r+1]);
                    }
                    else if(sum<target){
                        while(++l<r && nums[l]==nums[l-1]);
                    }
                    else{
                        while(--r>l && nums[r]==nums[r+1]);
                    }
                }
            }
        }
        return result;
    }
    

    }


  • 0
    G

    it seems to me your code is over complicated. within for-loop you have another 3 layers of nested loops with several if else condition.


Log in to reply
 

Looks like your connection to LeetCode Discuss was lost, please wait while we try to reconnect.