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Submission #103540

# Submission time Handle Problem Language Result Execution time Memory
103540 2019-03-31T11:21:31 Z Hideo Duathlon (APIO18_duathlon) C++14
0 / 100
 151 ms 8760 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define mk make_pair
#define pb push_back
#define fr first
#define sc second
#define vi vector < int >
#define pii pair < int, int >

const int N = 2e5 + 7;
const int INF = 1e9 + 7;

int sz[N];
int n, m;
ll ans;

vi g[N];

void dfs (int v = 1, int p = 0){
    sz[v] = 1;
    for (int to : g[v]){
        if (to != p){
            dfs(to, v);
            sz[v] += sz[to];
        }
    }

}

main(){
    cin >> n >> m;
    for (int i = 1; i <= m; i++){
        int a, b;
        cin >> a >> b;
        g[a].pb(b);
        g[b].pb(a);
    }
    if (m == n - 1){
        dfs();
        for (int i = 1; i <= n; i++){
            ans += sz[i] * (n - sz[i]);
        }
        ans -= n - 1;
        cout << (ll) ans * 2 - ((n * - 1) * (n - 2));
    }
    else {
        cout << 0;
    }
}

Compilation message

count_triplets.cpp:32:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 151 ms 8100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 143 ms 8760 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 117 ms 8664 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5120 KB Output isn't correct
2 Halted 0 ms 0 KB -