Submission #89153

#	Time	Username	Problem	Language	Result	Execution time	Memory
89153		faustaadp	철인 이종 경기 (APIO18_duathlon)	C++17	0 / 100	1094 ms	1049600 KiB

count_triplets

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
ll n,m,i,ta,tb,has,besar[101010];
vector<ll> v[101010];
ll dfs1(ll aa,ll bb)
{
    besar[aa]=1;
    ll ii;
    for(ii=0;ii<v[aa].size();ii++)
    {
        if(v[aa][ii]==bb)continue;
        dfs1(v[aa][ii],aa);
        besar[aa]+=besar[v[aa][ii]];
    }
}
ll dfs2(ll aa,ll bb)
{
    ll ii,tot=0;
    vector<ll> x;
    x.pb(n-besar[aa]);
    for(ii=0;ii<v[aa].size();ii++)
        if(v[aa][ii]!=bb)
            x.pb(besar[v[aa][ii]]);
    for(ii=0;ii<v[aa].size();ii++)
        if(v[aa][ii]!=bb)
            dfs2(v[aa][ii],aa);
    for(ii=0;ii<x.size();ii++)
    {
  //      cout<<aa<<" "<<2<<" "<<x[ii]<<" "<<tot<<"\n";
        has+=2LL*x[ii]*tot;
        tot+=x[ii];
    }
}
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>m;
    for(i=1;i<=m;i++)
    {
        cin>>ta>>tb;
        v[ta].pb(tb);
        v[tb].pb(ta);
    }
    dfs1(1,1);
    dfs2(1,1);
    cout<<has<<"\n";
}

Compilation message (stderr)

count_triplets.cpp: In function 'long long int dfs1(long long int, long long int)':
count_triplets.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ii=0;ii<v[aa].size();ii++)
              ~~^~~~~~~~~~~~~
count_triplets.cpp:20:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
count_triplets.cpp: In function 'long long int dfs2(long long int, long long int)':
count_triplets.cpp:26:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ii=0;ii<v[aa].size();ii++)
              ~~^~~~~~~~~~~~~
count_triplets.cpp:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ii=0;ii<v[aa].size();ii++)
              ~~^~~~~~~~~~~~~
count_triplets.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ii=0;ii<x.size();ii++)
              ~~^~~~~~~~~
count_triplets.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• 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