Question Name:Find all four sum numbers

#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <queue>
#include <deque>
#include <bitset>
#include <iterator>
#include <list>
#include <stack>
#include <map>
#include <set>
#include <functional>
#include <numeric>
#include <utility>
#include <climits>
#include <iomanip>
#include <unordered_map>
#include <time.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include<iostream>
using namespace std;
#define ll long long


void fnc(vector<int>v,int k)
{ int fg=0;    
  sort(v.begin(),v.end());
  set<vector<int>>st;
  
  for(int a=0;a<v.size();a++)
  {
      for(int b=a+1;b<v.size();b++)
      {
        int sum=v[a]+v[b];
        for(int i=b+1,j=v.size()-1;i<j && sum<=k;)
        {
            if(sum+v[i]+v[j]==k) 
            {fg=1;
            vector<int> t={v[a],v[b],v[i],v[j]};
            if(st.find(t)==st.end())    {cout<<v[a]<<" "<<v[b]<<" "<<v[i]<<" "<<v[j]<<" $";}
            st.insert(t); i++;j--;    
            }
            else if(sum+v[i]+v[j]<k) {i++;}
            else j--;
        }
      }
  }
  if(fg==0) cout<<"-1";
}

int main()
{int t,m,k;
 //string s;
 
 cin>>t;
 while(t--)
 {
  cin>>m>>k;
  //cin>>s;
  vector<int>v(m);
  for(int i=0;i<m;i++) cin>>v[i];
  //cout<<fnc(v)<<endl; 
  fnc(v,k);
  cout<<endl;
}

 return 0;
}

Problem Description

Given an array A of size N, find all combination of four elements in the array whose sum is equal to a given value K. For example, if the given array is {10, 2, 3, 4, 5, 9, 7, 8} and K = 23, one of the quadruple is 3 5 7 8 (3 + 5 + 7 + 8 = 23).
Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains two lines. The first line of input contains two integers N and K. Then in the next line are N space separated values of the array.
Output:
For each test case in a new line print all the quadruples present in the array separated by space which sums up to value of K. Each quadruple is unique which are separated by a delimeter “$” and are in increasing order.
Constraints:
1<=T<=100
1<=N<=100
-1000<=K<=1000
-100<=A[]<=100

• Test Case 1

  Input (stdin)
  

  2
  5 3
  0 0 2 1 1 
  7 23
  10 2 3 4 5 7 8

  Expected Output
  

  0 0 1 2 $
  2 3 8 10 $2 4 7 10 $3 5 7 8 $

• Test Case 2

  Input (stdin)
  

  1
  5 3
  0 0 2 1 1

  Expected Output
  

  0 0 1 2 $

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