Submission #980784

#	Time	Username	Problem	Language	Result	Execution time	Memory
980784		Unforgettablepl	Duathlon (APIO18_duathlon)	C++17	10 / 100	1106 ms	1048576 KiB

count_triplets

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

#define int long long

vector<int> adj[200001];
int ans;

void dfs(int x,int p,int depth){
    ans+=depth;
    for(int&i:adj[x])if(i!=p)dfs(i,x,depth+1);
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,m;
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        int a,b;cin>>a>>b;
        adj[a].emplace_back(b);
        adj[b].emplace_back(a);
    }
    for(int i=1;i<=n;i++)dfs(i,0,-1);
    cout << ans+n << '\n';
}

• 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