Counting Spanning Trees (Undirected) (verify/linalg/spanning_undirected.test.cpp)

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• Last update: 2025-12-22 00:33:40+01:00
• Problem: https://judge.yosupo.jp/problem/counting_spanning_tree_undirected

Depends on

• cp-algo/linalg/matrix.hpp
• cp-algo/linalg/vector.hpp
• cp-algo/math/combinatorics.hpp
• cp-algo/math/common.hpp
• cp-algo/number_theory/modint.hpp
• cp-algo/random/rng.hpp
• cp-algo/util/big_alloc.hpp
• cp-algo/util/checkpoint.hpp
• cp-algo/util/simd.hpp

Code

// @brief Counting Spanning Trees (Undirected)
#define PROBLEM "https://judge.yosupo.jp/problem/counting_spanning_tree_undirected"
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
//#include "blazingio/blazingio.min.hpp"
#include "cp-algo/math/combinatorics.hpp"
#include "cp-algo/linalg/matrix.hpp"

using namespace std;
using namespace cp_algo::math;
using namespace cp_algo::linalg;

const int64_t mod = 998244353;
using base = modint<mod>;

void solve() {
    int n, m;
    cin >> n >> m;
    matrix<base> a(n);
    for(int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        a[u][v] -= 1;
        a[v][u] -= 1;
        a[v][v] += 1;
        a[u][u] += 1;
    }
    for(int i = 0; i < n; i++) {
        a[0][i] = a[i][0] = 0;
    }
    a[0][0] = 1;
    cout << a.det() << "\n";
}

signed main() {
    //freopen("input.txt", "r", stdin);
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    // cin >> t;
    while(t--) {
        solve();
    }
}

Traceback (most recent call last):
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj_resolve/resolver.py", line 181, in resolve
    bundled_code = language.bundle(path, basedir=basedir)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/verify/languages/cplusplus.py", line 252, in bundle
    bundler.update(path)
  File "/home/runner/.local/lib/python3.12/site-packages/competitive_verifier/oj/verify/languages/cplusplus_bundle.py", line 327, in update
    assert len(lines) == len(uncommented_lines)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

Test cases

Env	Name	Status	Elapsed	Memory
g++	example_00	AC	5 ms	4 MB
g++	example_01	AC	5 ms	4 MB
g++	example_02	AC	5 ms	4 MB
g++	example_03	AC	5 ms	4 MB
g++	max_00	AC	75 ms	8 MB
g++	max_01	AC	75 ms	8 MB
g++	max_02	AC	74 ms	8 MB
g++	random_00	AC	50 ms	4 MB
g++	random_01	AC	51 ms	4 MB
g++	random_02	AC	40 ms	4 MB
g++	random_03	AC	9 ms	4 MB
g++	random_04	AC	15 ms	4 MB
g++	small_00	AC	5 ms	4 MB
g++	small_01	AC	5 ms	4 MB
g++	small_02	AC	4 ms	4 MB
g++	small_03	AC	5 ms	4 MB
g++	small_04	AC	4 ms	4 MB
g++	small_05	AC	5 ms	4 MB
g++	small_06	AC	5 ms	4 MB
g++	small_07	AC	5 ms	4 MB
g++	small_08	AC	5 ms	4 MB
g++	small_09	AC	5 ms	4 MB

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