why is not the value of y changing???

Hey guys…whys isn’t the value of the “y” being changed up … after the bfs() is being called up .Even though the value of “y” is being increased up in the bfs() function which is running.

#include<cstdio>
#include<iostream>
#include<vector>
#include<conio.h>
#include<list>
using namespace std;
int bfs(int a);
int visited[100006]={0};
list<int> v[100006];
list<int> l;
int routes;
long long int captain;
long long int y=1;
int main()
{
    int t,n,m,i,j,k,l,a,b,c;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d   %d",&n,&m);
        for(i=1;i<=m;i++)
        {
            scanf("%d  %d",&a,&b);
            v[a].push_back(b);
            v[b].push_back(a);
        }
        
       
        
       captain=1;long long int y=1;
        for(i=1;i<=n;i++)
        {
            if(visited[i]==0)
            {bfs(i);routes++;printf("ans   y    %d\n",y);captain=captain*y;}
        }        
        printf("%d %d\n",routes,captain);
    }
    getch();
}


int bfs(int a)
{  l.push_back(a);     
  visited[a]=1;
  list<int>::iterator it,c;
  while(l.empty()==false)
  {    c=l.begin();
     visited[*c]=1;
   printf("y    %d\n",y);
     for(it=v[*c].begin();it!=v[*c].end();++it)
      {if(visited[*it]==0){l.push_back(*it);}visited[*it]=1;}
      l.pop_front();   y++;
 
      
  }
}

You have a local declaration of y in main()

THNX…A LOT

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