Submission #104347

#	Time	Username	Problem	Language	Result	Execution time	Memory
104347		tc_abd	Duathlon (APIO18_duathlon)	C++14	0 / 100	1057 ms	540 KiB

count_triplets

#include <bits/stdc++.h>
using namespace std;
int n,m,ans;
bool done[1009];
vector < int > v[1009];
void dfs(int node,int f,int w){
    if(node == f){ans+=w-1;return;}
    done[node] = 1;
    for(int i=0;i<v[node].size();i++){
        int u = v[node][i];
        if(!done[u]) dfs(u,f,w+1);
    }
}
int main(){
    cin>>n>>m;
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--;b--;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            memset(done,0,sizeof(done));
            dfs(i,j,0);
        }
    }
    cout<<ans*2<<endl;
}

Compilation message (stderr)

count_triplets.cpp: In function 'void dfs(int, int, int)':
count_triplets.cpp:9:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[node].size();i++){
                 ~^~~~~~~~~~~~~~~

• 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