結果

問題 No.2456 Stamp Art
ユーザー pitP
提出日時 2023-09-01 23:27:41
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 3,528 bytes
コンパイル時間 4,303 ms
コンパイル使用メモリ 255,464 KB
最終ジャッジ日時 2025-02-16 17:28:08
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 8 WA * 15
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
istream &operator>>(istream &is, modint &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint &a) { return os << a.val(); }
istream &operator>>(istream &is, modint998244353 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint998244353 &a) { return os << a.val(); }
istream &operator>>(istream &is, modint1000000007 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint1000000007 &a) { return os << a.val(); }
typedef long long ll;
typedef vector<vector<int>> Graph;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define rep(i,n) for (int i = 0;i < (int)(n); i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define my_sort(x) sort(x.begin(), x.end())
#define my_max(x) *max_element(all(x))
#define my_min(x) *min_element(all(x))
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int INF = (1<<30) - 1;
const ll LINF = (1LL<<62) - 1;
const int MOD = 998244353;
const int MOD2 = 1e9+7;
const double PI = acos(-1);
vector<int> di = {1,0,-1,0};
vector<int> dj = {0,1,0,-1};
#ifdef LOCAL
# include <debug_print.hpp>
# define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
# define debug(...) (static_cast<void>(0))
#endif
/* BIT2D:
0
add(h,w,x): (h,w) x
sum(h,w): 1≦i≦h 1≦j≦w
query(h1,w1,h2,w2): h1≦i<h2 w1≦j<w2 (1-indexed)
O(logW * logH)
*/
template <typename T>
struct BIT2D {
int H, W;
vector<vector<T>> bit; //
BIT2D(int H_, int W_) { init(H_, W_); }
void init(int H_, int W_) {
H = H_ + 1;
W = W_ + 1;
bit.assign(H, vector<T>(W, 0));
}
void add(int h, int w, T x) {
for (int i = h; i < H; i += (i & -i)) {
for (int j = w; j < W; j += (j & -j)) {
bit[i][j] += x;
}
}
}
// 1≦i≦h 1≦j≦w
T sum(int h, int w) {
T s(0);
for (int i = h; i > 0; i -= (i & -i)) {
for (int j = w; j > 0; j -= (j & -j)) {
s += bit[i][j];
}
}
return s;
}
// h1≦i<h2 w1≦j<w2
T query(int h1, int w1, int h2, int w2) {
return sum(h2 - 1, w2 - 1) - sum(h2 - 1, w1 - 1) - sum(h1 - 1, w2 - 1) + sum(h1 - 1, w1 - 1);
}
};
int H,W;
char S[2020][2020];
bool is_ok(int k){
BIT2D<int> BIT(H,W);
for(int i=1;i<=H;i++){
for(int j=1;j<=W;j++){
int wa = BIT.query(max(i - k + 1, 1), max(j - k + 1, 1), i + 1, j + 1);
if (S[i][j] == '.'){
if (wa > 0) return false;
}
else{
if (wa == 0) BIT.add(i, j, 1);
}
}
}
return true;
}
int main(){
cin.tie(0);
ios_base::sync_with_stdio(false);
cin >> H >> W;
for(int i=1;i<=H;i++){
for(int j=1;j<=W;j++){
cin >> S[i][j];
}
}
int ok = 0, ng = H + 1;
while(abs(ok - ng) > 1){
int k = (ok + ng) / 2;
if (is_ok(k)) ok = k;
else ng = k;
}
cout << ok << endl;
}
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