結果
| 問題 |
No.2456 Stamp Art
|
| コンテスト | |
| ユーザー |
Forested
|
| 提出日時 | 2023-09-01 21:46:46 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 825 ms / 5,000 ms |
| コード長 | 3,294 bytes |
| コンパイル時間 | 1,739 ms |
| コンパイル使用メモリ | 129,680 KB |
| 最終ジャッジ日時 | 2025-02-16 16:28:24 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 23 |
ソースコード
#ifndef LOCAL
#define FAST_IO
#endif
// ============
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER(i, n) for (i32 i = (i32)(n) - 1; i >= 0; --i)
#define ALL(x) begin(x), end(x)
using namespace std;
using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;
template <typename T>
using Vec = vector<T>;
template <typename T>
bool chmin(T &x, const T &y) {
if (x > y) {
x = y;
return true;
}
return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
if (x < y) {
x = y;
return true;
}
return false;
}
#ifdef INT128
using u128 = __uint128_t;
using i128 = __int128_t;
istream &operator>>(istream &is, i128 &x) {
i64 v;
is >> v;
x = v;
return is;
}
ostream &operator<<(ostream &os, i128 x) {
os << (i64)x;
return os;
}
istream &operator>>(istream &is, u128 &x) {
u64 v;
is >> v;
x = v;
return is;
}
ostream &operator<<(ostream &os, u128 x) {
os << (u64)x;
return os;
}
#endif
[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
SetUpIO() {
#ifdef FAST_IO
ios::sync_with_stdio(false);
cin.tie(nullptr);
#endif
cout << fixed << setprecision(15);
}
} set_up_io;
// ============
#ifdef DEBUGF
#else
#define DBG(x) (void)0
#endif
int main() {
i32 h, w;
cin >> h >> w;
Vec<string> s(h);
REP(i, h) {
cin >> s[i];
}
Vec<Vec<i32>> sum(h + 1, Vec<i32>(w + 1, 0));
REP(i, h) REP(j, w) {
sum[i + 1][j + 1] = sum[i][j + 1] + sum[i + 1][j] - sum[i][j] + (s[i][j] == '#');
}
i32 ok = 1, ng = max(h, w) + 1;
const auto judge = [&](i32 x) -> bool {
Vec<Vec<i32>> add(h + 1, Vec<i32>(w + 1, 0));
REP(i, h - x + 1) REP(j, w - x + 1) {
i32 s = sum[i + x][j + x] - sum[i][j + x] - sum[i + x][j] + sum[i][j];
if (s == x * x) {
add[i][j] += 1;
add[i + x][j] -= 1;
add[i][j + x] -= 1;
add[i + x][j + x] += 1;
}
}
REP(i, h) REP(j, w + 1) {
add[i + 1][j] += add[i][j];
}
REP(i, h + 1) REP(j, w) {
add[i][j + 1] += add[i][j];
}
REP(i, h) REP(j, w) {
char c = add[i][j] ? '#' : '.';
if (c != s[i][j]) {
return false;
}
}
return true;
};
while (ng - ok > 1) {
i32 mid = (ok + ng) / 2;
if (judge(mid)) {
ok = mid;
} else {
ng = mid;
}
}
cout << ok << '\n';
}
Forested