Submission #104346

#	Time	Username	Problem	Language	Result	Execution time	Memory
104346		_demon_	Duathlon (APIO18_duathlon)	C++14	10 / 100	1132 ms	885796 KiB

count_triplets

#include <bits/stdc++.h>
using namespace std;
int n,m;
vector<int>v[1009];
int child[1009][1009];
int num[1009];
void dfs(int node,int p,int r){
    for(int i=0;i<v[node].size();i++){
        int u=v[node][i];
        if(u==p) continue;
        dfs(u,node,r);
        child[r][node]+=child[r][u]+1;
    }
}
void dfs2(int node,int p,int r){
    for(int i=0;i<v[node].size();i++){
        int u=v[node][i];
        if(u==p) continue;
        num[r]+=child[r][u];
        dfs2(u,node,r);
    }
}
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++){
        dfs(i,i,i);
    }
    for(int i=0;i<n;i++){
        dfs2(i,i,i);
    }
	int ans=0;
    for(int i=0;i<n;i++){
        ans+=num[i];
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

count_triplets.cpp: In function 'void dfs(int, int, int)':
count_triplets.cpp:8:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<v[node].size();i++){
                 ~^~~~~~~~~~~~~~~
count_triplets.cpp: In function 'void dfs2(int, int, int)':
count_triplets.cpp:16:18: 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: 10 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10