oj.uz

Submission #698800

# Submission time Handle Problem Language Result Execution time Memory
698800 2023-02-14T10:06:32 Z vjudge1 Duathlon (APIO18_duathlon) C++17
0 / 100
 66 ms 19780 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define endl '\n'

const int M = 3e5+5, MOD = 1e9+7;
int d[M], noc[M], n, dp[M], vis[M];
vector<int> node[M];

void dfs(int s, int p = 1) {
    noc[s]++;
    vis[s] = true;
    for (int i:node[s]) {
        if (!vis[i]) {
            d[i] = d[s]+1;
            dfs(i, s);
            noc[s] += noc[i];
        }
    }
}

void dfs2(int s, int p = 1) {
    vis[s] = true;
    for (int i:node[s]) {
        if (!vis[i]) {
            dp[i] = dp[s] + n - 2*noc[i];
            dfs2(i, s);
        }
    }
}

signed main() {
    cin.tie(0)->sync_with_stdio(0);

    int m;
    cin >> n >> m;

    for (int i = 1; i <= m; i++) {
        int a, b;
        cin >> a >> b;
        node[a].push_back(b);
        node[b].push_back(a);
    } dfs(1);
    for (int i = 1; i <= n; i++) dp[1] += d[i], vis[i] = 0;

    dfs2(1);
    int ans = 0;
    for (int i = 1; i <= n; i++) ans += dp[i] - n + 1, ans %= MOD;
    cout << ans << endl;

    return 0;
}
/*
4 3
1 2 2 3 3 4
*/

Subtask #1
0 / 5.0

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

Subtask #2
0 / 11.0

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

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 66 ms 19780 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7416 KB Output is correct
2 Correct 4 ms 7464 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7508 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 5 ms 7380 KB Output is correct
10 Incorrect 4 ms 7380 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 60 ms 14216 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7380 KB Output is correct
2 Correct 6 ms 7352 KB Output is correct
3 Incorrect 4 ms 7380 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 14308 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

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

Subtask #9
0 / 10.0

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