Submission #262364

#	Time	Username	Problem	Language	Result	Execution time	Memory
262364		CaroLinda	Duathlon (APIO18_duathlon)	C++14	0 / 100	79 ms	11384 KiB

count_triplets

#include <bits/stdc++.h>

#define lp(i,a,b) for(int i = a; i < b ; i++)
#define ff first
#define ss second
#define pb emplace_back
#define ll long long
#define mk make_pair
#define sz(x) x.size()
#define pii pair<int,int>
#define mkt make_tuple
#define debug

const int MAXN = 1e5+10 ;

using namespace std ;

int N , M ;
ll sub[MAXN] ;
ll resp ;
bool vis[MAXN] ;
vector<int> adj[MAXN] ;

void dfs(int x)
{
    vis[x] = true ;
    sub[x] = 0LL ;

    for(auto y : adj[x] )
    {
        if(vis[y]) continue ;
        dfs(y) ;

        resp += sub[x] * sub[y] * 2LL ;
        resp += sub[y] * (sub[y]-1) ;
        sub[x] += sub[y] ;

    }

    sub[x]++ ;

}

int main()
{

    scanf("%d%d", &N , &M ) ;
    for(int i = 1 , u , v ; i <= M ; i++ )
    {
        scanf("%d%d", &u, &v ) ;
        adj[u].pb(v) ;
        adj[v].pb(u) ;
    }

    lp(i,1,N+1)
        if(!vis[i]) dfs(i) ;

    printf("%lld\n" , resp ) ;

}

Compilation message (stderr)

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |     scanf("%d%d", &N , &M ) ;
      |     ~~~~~^~~~~~~~~~~~~~~~~~
count_triplets.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |         scanf("%d%d", &u, &v ) ;
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10