結果
| 問題 |
No.1421 国勢調査 (Hard)
|
| コンテスト | |
| ユーザー |
hitonanode
|
| 提出日時 | 2022-11-06 22:09:05 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 22 ms / 2,000 ms |
| コード長 | 4,885 bytes |
| コンパイル時間 | 1,320 ms |
| コンパイル使用メモリ | 112,516 KB |
| 実行使用メモリ | 5,376 KB |
| 最終ジャッジ日時 | 2024-07-20 09:18:20 |
| 合計ジャッジ時間 | 3,485 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 30 |
ソースコード
#line 1 "linear_algebra_matrix/test/linalg_bitset.yuki1421.test.cpp"
#define PROBLEM "https://yukicoder.me/problems/no/1421"
#line 2 "linear_algebra_matrix/linalg_bitset.hpp"
#include <bitset>
#include <cassert>
#include <tuple>
#include <utility>
#include <vector>
// Gauss-Jordan elimination of n * m matrix M
// Complexity: O(nm + nm rank(M) / 64)
// Verified: abc276_h (2000 x 8000)
template <int Wmax>
std::vector<std::bitset<Wmax>> gauss_jordan(int W, std::vector<std::bitset<Wmax>> M) {
assert(W <= Wmax);
int H = M.size(), c = 0;
for (int h = 0; h < H and c < W; ++h, ++c) {
int piv = -1;
for (int j = h; j < H; ++j) {
if (M[j][c]) {
piv = j;
break;
}
}
if (piv == -1) {
--h;
continue;
}
std::swap(M[piv], M[h]);
for (int hh = 0; hh < H; ++hh) {
if (hh != h and M[hh][c]) M[hh] ^= M[h];
}
}
return M;
}
// Rank of Gauss-Jordan eliminated matrix
template <int Wmax> int rank_gauss_jordan(int W, const std::vector<std::bitset<Wmax>> &M) {
assert(W <= Wmax);
for (int h = (int)M.size() - 1; h >= 0; h--) {
int j = 0;
while (j < W and !M[h][j]) ++j;
if (j < W) return h + 1;
}
return 0;
}
template <int W1, int W2>
std::vector<std::bitset<W2>>
matmul(const std::vector<std::bitset<W1>> &A, const std::vector<std::bitset<W2>> &B) {
int H = A.size(), K = B.size();
std::vector<std::bitset<W2>> C(H);
for (int i = 0; i < H; i++) {
for (int j = 0; j < K; j++) {
if (A[i][j]) C[i] ^= B[j];
}
}
return C;
}
template <int Wmax>
std::vector<std::bitset<Wmax>> matpower(std::vector<std::bitset<Wmax>> X, long long n) {
int D = X.size();
std::vector<std::bitset<Wmax>> ret(D);
for (int i = 0; i < D; i++) ret[i][i] = 1;
while (n) {
if (n & 1) ret = matmul<Wmax, Wmax>(ret, X);
X = matmul<Wmax, Wmax>(X, X), n >>= 1;
}
return ret;
}
// Solve Ax = b on F_2
// - retval: {true, one of the solutions, {freedoms}} (if solution exists)
// {false, {}, {}} (otherwise)
template <int Wmax, class Vec>
std::tuple<bool, std::bitset<Wmax>, std::vector<std::bitset<Wmax>>>
system_of_linear_equations(std::vector<std::bitset<Wmax>> A, Vec b, int W) {
int H = A.size();
assert(W <= Wmax);
assert(A.size() == b.size());
std::vector<std::bitset<Wmax + 1>> M(H);
for (int i = 0; i < H; ++i) {
for (int j = 0; j < W; ++j) M[i][j] = A[i][j];
M[i][W] = b[i];
}
M = gauss_jordan<Wmax + 1>(W + 1, M);
std::vector<int> ss(W, -1);
for (int i = 0; i < H; i++) {
int j = 0;
while (j <= W and !M[i][j]) ++j;
if (j == W) return {false, 0, {}};
if (j < W) ss[j] = i;
}
std::bitset<Wmax> x;
std::vector<std::bitset<Wmax>> D;
for (int j = 0; j < W; ++j) {
if (ss[j] == -1) {
std::bitset<Wmax> d;
d[j] = 1;
for (int jj = 0; jj < W; jj++)
if (ss[jj] != -1) d[jj] = M[ss[jj]][j];
D.emplace_back(d);
} else {
x[j] = M[ss[j]][W];
}
}
return std::make_tuple(true, x, D);
}
#line 3 "linear_algebra_matrix/test/linalg_bitset.yuki1421.test.cpp"
#include <iostream>
#line 6 "linear_algebra_matrix/test/linalg_bitset.yuki1421.test.cpp"
using namespace std;
template <typename T> bool chmin(T &m, const T q) {
if (m > q) {
m = q;
return true;
} else
return false;
}
void bad() {
puts("-1");
exit(0);
}
int main() {
cin.tie(nullptr), ios::sync_with_stdio(false);
int N, M;
cin >> N >> M;
using ull = unsigned long long;
vector<pair<ull, int>> basis;
while (M--) {
int a;
cin >> a;
ull mask = 0;
while (a--) {
int b;
cin >> b;
b--;
mask += 1ULL << b;
}
int y;
cin >> y;
for (auto [v, w] : basis) {
if (chmin(mask, mask ^ v)) y ^= w;
}
if (!mask and y) bad();
if (mask) basis.emplace_back(mask, y);
}
vector<int> ret(N);
for (int d = 0; d < 30; ++d) {
constexpr int Wmax = 320;
vector<bitset<Wmax>> A;
vector<bool> b;
for (int i = 0; i < int(basis.size()); ++i) {
b.push_back((basis[i].second >> d) & 1);
bitset<Wmax> a;
a.reset();
for (int j = 0; j < N; ++j) {
if ((basis[i].first >> j) & 1) a[j] = 1;
}
A.emplace_back(a);
}
auto [ok, solution, freedoms] = system_of_linear_equations<Wmax>(A, b, N);
if (!ok) bad();
for (int i = 0; i < N; ++i) ret[i] += int(solution[i]) << d;
}
for (auto x : ret) cout << x << '\n';
}
hitonanode