fourSum

#include <bits/stdc++.h>

string fourSum(vector<int> nums, int target, int n) {

        sort(nums.begin(),nums.end());
        for(int i=0;i<n;i++)
        {
            for(int j=i+1;j<n;j++)
            {
                int k=j+1;
                int l=n-1;
                while(k<l)
                {
                    long long sum = nums[i];
                    sum += nums[j];
                    sum += nums[k];
                    sum += nums[l];
                    if(sum == target)
                    {
                        vector<int> temp={nums[i],nums[j],nums[k],nums[l]};
                        return "Yes";
                        k++;
                        l--;
                        while(k<l && nums[k]==nums[k-1]) k++;
                        while(k<l && nums[l]==nums[l+1]) l--;
                    }
                    else if (sum > target)
                        l--;
                    else
                        k++;
                    
                }
            }
        }
        return "No";
        

}