Determinant of Matrix (Mod 2) (verify/structures/bitpack/det_mod_2.test.cpp)

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• Last update: 2025-12-13 14:30:50+01:00
• Problem: https://judge.yosupo.jp/problem/matrix_det_mod_2

Depends on

• cp-algo/structures/bit_array.hpp
• cp-algo/structures/bit_array_util.hpp
• cp-algo/util/big_alloc.hpp
• cp-algo/util/bit.hpp
• cp-algo/util/simd.hpp

Code

// @brief Determinant of Matrix (Mod 2)
#define PROBLEM "https://judge.yosupo.jp/problem/matrix_det_mod_2"
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#include "cp-algo/structures/bit_array_util.hpp"
#include <bits/stdc++.h>

using namespace std;
using cp_algo::structures::bit_array;

const int maxn = 1 << 12;
bit_array<maxn> a[maxn];

void solve() {
    size_t n;
    cin >> n;
    cp_algo::big_string row;
    cp_algo::big_vector<size_t> lead(n);
    for(size_t i = 0; i < n; i++) {
        cin >> row;
        from_string(a[i], row);
        for(size_t j = 0; j < i; j++) {
            if(a[i][lead[j]]) {
                a[i].xor_hint(a[j], lead[j]);
            }
        }
        lead[i] = ctz(a[i]);
        if(lead[i] == n) {
            cout << 0 << "\n";
            return;
        }
    }
    cout << 1 << "\n";
}

signed main() {
    //freopen("input.txt", "r", stdin);
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    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	4 ms	4 MB
g++	example_01	AC	4 ms	4 MB
g++	lowrank_max_random_00	AC	35 ms	4 MB
g++	lowrank_max_random_01	AC	139 ms	6 MB
g++	lowrank_max_random_02	AC	38 ms	5 MB
g++	lowrank_max_random_03	AC	33 ms	4 MB
g++	lowrank_max_random_04	AC	19 ms	4 MB
g++	max_random_00	AC	203 ms	6 MB
g++	max_random_01	AC	204 ms	6 MB
g++	max_random_02	AC	204 ms	6 MB
g++	max_random_03	AC	205 ms	6 MB
g++	max_random_04	AC	203 ms	6 MB
g++	max_random_05	AC	203 ms	6 MB
g++	middle_00	AC	8 ms	4 MB
g++	middle_01	AC	5 ms	4 MB
g++	middle_02	AC	4 ms	4 MB
g++	middle_03	AC	5 ms	4 MB
g++	middle_04	AC	6 ms	4 MB
g++	middle_05	AC	9 ms	4 MB
g++	perm_max_random_00	AC	4 ms	4 MB
g++	perm_max_random_01	AC	4 ms	4 MB
g++	perm_max_random_02	AC	3 ms	4 MB
g++	perm_max_random_03	AC	3 ms	4 MB
g++	perm_max_random_04	AC	3 ms	4 MB
g++	random_00	AC	7 ms	4 MB
g++	random_01	AC	4 ms	4 MB
g++	random_02	AC	4 ms	4 MB
g++	random_03	AC	118 ms	5 MB
g++	random_04	AC	68 ms	5 MB
g++	random_05	AC	187 ms	6 MB
g++	small_00	AC	4 ms	4 MB
g++	small_01	AC	4 ms	4 MB
g++	small_02	AC	3 ms	4 MB
g++	small_03	AC	3 ms	4 MB
g++	small_04	AC	3 ms	4 MB
g++	small_05	AC	3 ms	4 MB

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