Search in a matrix

problem id:-http://practice.geeksforgeeks.org/problems/search-in-a-matrix/0

code:--

#include<iostream>
#include<vector>
using namespace std;
bool find_num(vector<vector<int>> a,int n,int i,int j,int x)
{
if(a[i][j]==x)
return 1;
else if(a[i][j]<x)
{
if(i+1<n)
return find_num(a,n,i+1,j,x);
else
return 0;
}
else
{
if(j-1>=0)
return find_num(a,n,i,j-1,x);
else
return 0;
}
}
int main()
{
int t;
cin>>t;
while(t--)
    {
    int n,m;
    cin>>n>>m;
    vector<vector<int>> a(n,vector<int>(m));
    for(int i=0;i<n;++i)
    for(int j=0;j<m;++j)
    cin>>a[i][j];
    int x;
    cin>>x;
    bool ans;
ans=find_num(a,n,0,m-1,x);
    cout<<ans<<'\n';
    }

return 0;
}