oj.uz

Submission #710186

# Submission time Handle Problem Language Result Execution time Memory
710186 2023-03-15T05:36:17 Z vjudge1 Duathlon (APIO18_duathlon) C++17
0 / 100
 1000 ms 1048576 KB 
/*
Author : DeMen100ns (a.k.a Vo Khac Trieu)
School : VNU-HCM High school for the Gifted
fuck you adhoc
*/

#include <bits/stdc++.h>
#define endl '\n'

#define int long long

using namespace std;

const int N = 3e5 + 5;
const long long INF = 1e18 + 7;
const int MAXA = 1e9;
const int B = sqrt(N) + 5;

vector <int> a[N];
int sub[N]; bool f[N];
int ans = 0, n;

void dfs(int root, int u, int par = 0){
    f[u] = true;
    int sum = 0;
    for(int i : a[u]){
        if (i == par) continue;
        dfs(root, i, u);

        ans += sum * sub[i];
        sum += sub[i];
    }
    ans += (sub[root] - sub[u]) * (sub[u] - 1);
    sub[u]++;
}

void dfs_precal(int u, int par = 0){
    sub[u] = 1;
    for(int i : a[u]){
        if (i == par) continue;
        dfs_precal(i, u);

        sub[u] += sub[i];
    }
}

void solve()
{
    int m; cin >> n >> m;
    for(int i = 1; i <= m; ++i){
        int u, v; cin >> u >> v;
        a[u].push_back(v);
        a[v].push_back(u);
    }

    for(int i = 1; i <= n; ++i){
        if (!f[i]){
            dfs_precal(i);
            dfs(i, i);
        }
    }

    cout << 2ll * ans;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    // freopen("codeforces.inp","r",stdin);
    // freopen("codeforces.out","w",stdout);

    int t = 1; // cin >> t;
    while (t--)
    {
        solve();
    }
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 481 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 481 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1056 ms 471204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 60 ms 12008 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 49 ms 11980 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 481 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 481 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -