結果
| 問題 |
No.2505 matriX cOnstRuction
|
| コンテスト | |
| ユーザー |
emthrm
|
| 提出日時 | 2023-07-26 19:33:17 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 350 ms / 2,500 ms |
| コード長 | 5,363 bytes |
| コンパイル時間 | 1,623 ms |
| コンパイル使用メモリ | 129,096 KB |
| 実行使用メモリ | 9,860 KB |
| 最終ジャッジ日時 | 2024-09-15 14:06:44 |
| 合計ジャッジ時間 | 7,701 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 64 |
ソースコード
#include <algorithm>
#include <array>
#include <bit>
#include <bitset>
#include <cassert>
#include <iostream>
#include <iterator>
#include <numeric>
#include <tuple>
#include <vector>
int KthBit(const int x, const int k) { return x >> k & 1; }
// <AC>
// できる限り枝刈りを行っている。
template <int D>
int Solve(const std::vector<int>& rc, const std::vector<std::vector<int>>& a) {
const int n = a.size(), m = a.front().size();
assert(std::ssize(rc) == n + m);
// ビットごと 2 グループに分ける
std::vector group(n + m, std::bitset<D>());
for (int bit = 0; bit < D; ++bit) {
const int criteria = KthBit(a.front().front(), bit);
for (int i = 1; i < n; ++i) {
const int is_diff = (KthBit(a[i].front(), bit) != criteria ? 1 : 0);
for (int j = 1; j < m; ++j) {
if (KthBit(a.front()[j], bit) ^ is_diff != KthBit(a[i][j], bit)) {
return -1;
}
}
if (is_diff == 1) group[i].set(bit);
}
if (criteria == 1) group[n].set(bit);
for (int j = 1; j < m; ++j) {
const int is_diff = (KthBit(a.front()[j], bit) != criteria ? 1 : 0);
for (int i = 1; i < n; ++i) {
if (KthBit(a[i].front(), bit) ^ is_diff != KthBit(a[i][j], bit)) {
return -1;
}
}
if (KthBit(a.front()[j], bit) == 1) group[j + n].set(bit);
}
}
const auto Operation = [&rc, &group](
const int bit, const int choice, const std::vector<int>& or_012,
const std::vector<int>& or_01, const std::vector<int>& or_12)
-> std::tuple<bool, int,
std::vector<int>, std::vector<int>, std::vector<int>> {
int cost = 0;
std::vector<int> next_or_012, next_or_01, next_or_12;
for (const int i : or_012) {
if (group[i][bit] == choice) { // 1
if (KthBit(rc[i], bit) == 0) {
return {false, 0,
std::vector<int>{}, std::vector<int>{}, std::vector<int>{}};
}
++cost;
next_or_12.emplace_back(i);
} else { // 0
(KthBit(rc[i], bit) == 1 ? next_or_01 : next_or_012).emplace_back(i);
}
}
for (const int i : or_01) {
if (group[i][bit] == choice) {
++cost;
} else {
next_or_01.emplace_back(i);
}
}
for (const int i : or_12) {
const int bit_of_i = (group[i][bit] == choice ? 1 : 0);
const int bit_of_rc = KthBit(rc[i], bit);
if (bit_of_i > bit_of_rc) {
++cost;
} else if (bit_of_i == bit_of_rc) {
next_or_12.emplace_back(i);
}
}
return {true, cost, next_or_012, next_or_01, next_or_12};
};
const int argmin = std::distance(rc.begin(), std::ranges::min_element(rc));
const int need_to_choose = // これより上位のビットは自由に選べない
std::bit_width(static_cast<unsigned int>(rc[argmin]));
int current_cost = 0;
std::vector<int> or_012(n + m), or_01, or_12;
std::iota(or_012.begin(), or_012.end(), 0);
for (int bit = D - 1; bit >= need_to_choose; --bit) {
const int choice = group[argmin][bit] ^ 1;
bool is_valid;
int added_cost;
std::tie(is_valid, added_cost, or_012, or_01, or_12) =
Operation(bit, choice, or_012, or_01, or_12);
if (!is_valid) return -1;
current_cost += added_cost;
}
int min_cost = (n + m) * 2 + 1;
// 上位からグループを決定する
const auto dfs = [Operation, &min_cost](
auto dfs, const int bit, const int current_cost,
const std::vector<int>& or_012,
const std::vector<int>& or_01, const std::vector<int>& or_12) -> void {
if ((or_012.empty() && or_01.empty() && or_12.empty()) || bit < 0) {
min_cost = std::min(min_cost, current_cost);
return;
}
std::array<int, 2> next_cost{};
std::array<std::vector<int>, 2> next_or_012{}, next_or_01{}, next_or_12{};
for (const int choice : std::array<int, 2>{0, 1}) {
std::tie(std::ignore, next_cost[choice],
next_or_012[choice], next_or_01[choice], next_or_12[choice]) =
Operation(bit, choice, or_012, or_01, or_12);
next_cost[choice] += current_cost;
}
const int earlier =
(next_cost[0] + next_or_012[0].size() + next_or_01[0].size()
< next_cost[1] + next_or_012[1].size() + next_or_01[1].size()
? 0 : 1);
for (const int parity : std::array<int, 2>{0, 1}) {
const int choice = parity ^ earlier;
if (next_cost[choice] >= min_cost) continue; // 枝刈り
dfs(dfs, bit - 1, next_cost[choice],
next_or_012[choice], next_or_01[choice], next_or_12[choice]);
}
};
dfs(dfs, need_to_choose - 1, current_cost, or_012, or_01, or_12);
return min_cost;
}
int main() {
constexpr int kMaxT = 50000, kMaxNM = 50000, kDigits = 30;
int t;
std::cin >> t;
assert(1 <= t && t <= kMaxT);
while (t--) {
int n, m;
std::cin >> n >> m;
assert(1 <= n && 1 <= m && n * m <= kMaxNM);
std::vector<int> rc(n + m);
for (int i = 0; i < n + m; ++i) {
std::cin >> rc[i];
assert(0 <= rc[i] && rc[i] < (1 << kDigits));
}
std::vector a(n, std::vector(m, 0));
for (int i = 0; i < n; ++i) {
for (int j = 0; j < m; ++j) {
std::cin >> a[i][j];
assert(0 <= a[i][j] && a[i][j] < (1 << kDigits));
}
}
std::cout << Solve<kDigits>(rc, a) << '\n';
}
return 0;
}
emthrm