Submission #39712018

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

typedef long long int ll;
#define IOS ios_base::sync_with_stdio(0);  cin.tie(0); cout.tie(0);


#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;


typedef tree<int,null_type, less<int>,rb_tree_tag, tree_order_statistics_node_update>order_set;
typedef pair<int,int>pr;
#define all(i)     i.begin() , i.end()
#define ft     first
#define sn     second
#define pb push_back


#define en "\n"
#define dbg cout<<"rony\n";

#define MAXN 2010
#define inf 1e8
const int mod = 998244353;

int n,m;
vector<int>g[MAXN];
int an;
int vis[MAXN];

int f(int nd)
{
    vis[nd] = 1;
    int cn = 1;
    for(auto i:g[nd])
    {
        if(vis[i]) continue;
        cn += f(i);
    }
   
    return cn;
}
void solve()
{

   cin >> n >> m;
   for(int i = 1;i <= m;i++)
   {
     int x,y;
     cin >> x >> y;
     g[x].pb(y);
   }
  
   for(int i = 1;i <= n;i++)
   {
       an += f(i);an--;
       an -= g[i].size();
       memset(vis,0,sizeof(vis));
   }

   cout<<an<<en;
}
int main()
{
    IOS;
   int t;
   t = 1;
    // cin >> t;
   int c = 0;
    while ( t-- )
    {
        // cout<<"Case "<<++c<<": ";
        solve();
    }
    return 0;
}   

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:71:8: warning: unused variable ‘c’ [-Wunused-variable]
   71 |    int c = 0;
      |        ^

Judge Result