Submission #980823

#	Time	Username	Problem	Language	Result	Execution time	Memory
980823		Unforgettablepl	Duathlon (APIO18_duathlon)	C++17	5 / 100	1053 ms	600 KiB

count_triplets

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

#define int long long

int adj[11][11];
bool ans[11][11][11];

void calc(const vector<int>& path){
    if(path.size()<3)return;
    for(int i=1;i<path.size();i++){
        if(!adj[path[i]][path[i-1]])return;
        for(int k=1;k<i;k++)ans[path[0]][path[k]][path[i]]=true;
    }
}

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][b]=adj[b][a]=true;
    }
    vector<int> path(n);iota(path.begin(), path.end(),1);
    do {
        calc(path);
    } while(next_permutation(path.begin(), path.end()));
    int curr = 0;
    for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)for(int k=1;k<=n;k++)if(ans[i][j][k])curr++;
    cout << curr << '\n';
}

Compilation message (stderr)

count_triplets.cpp: In function 'void calc(const std::vector<long long int>&)':
count_triplets.cpp:11:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i=1;i<path.size();i++){
      |                 ~^~~~~~~~~~~~

• Subtask 1: 5 / 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