結果
問題 | No.2456 Stamp Art |
ユーザー |
|
提出日時 | 2023-09-14 14:49:24 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 403 ms / 5,000 ms |
コード長 | 4,402 bytes |
コンパイル時間 | 4,503 ms |
コンパイル使用メモリ | 245,164 KB |
実行使用メモリ | 35,456 KB |
最終ジャッジ日時 | 2024-07-01 22:07:44 |
合計ジャッジ時間 | 11,800 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 * 3 |
other | AC * 23 |
ソースコード
#include <bits/stdc++.h>#include <atcoder/all>typedef long long int ll;using namespace std;typedef pair<ll, ll> P;using namespace atcoder;template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;#define USE998244353#ifdef USE998244353const ll MOD = 998244353;// const double PI = 3.1415926535897932;using mint = modint998244353;#elseconst ll MOD = 1000000007;using mint = modint1000000007;#endifconst int MAX = 2000001;long long fac[MAX], finv[MAX], inv[MAX];void COMinit() {fac[0] = fac[1] = 1;finv[0] = finv[1] = 1;inv[1] = 1;for (int i = 2; i < MAX; i++){fac[i] = fac[i - 1] * i % MOD;inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;finv[i] = finv[i - 1] * inv[i] % MOD;}}long long COM(int n, int k){if (n < k) return 0;if (n < 0 || k < 0) return 0;return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;}ll gcd(ll x, ll y) {if (y == 0) return x;else if (y > x) {return gcd (y, x);}else return gcd(x % y, y);}ll lcm(ll x, ll y) {return x / gcd(x, y) * y;}ll my_sqrt(ll x) {//ll m = 0;ll M = 3000000001;while (M - m > 1) {ll now = (M + m) / 2;if (now * now <= x) {m = now;}else {M = now;}}return m;}ll keta(ll num, ll arity) {ll ret = 0;while (num) {num /= arity;ret++;}return ret;}ll ceil(ll n, ll m) {// n > 0, m > 0ll ret = n / m;if (n % m) ret++;return ret;}ll pow_ll(ll x, ll n) {if (n == 0) return 1;if (n % 2) {return pow_ll(x, n - 1) * x;}else {ll tmp = pow_ll(x, n / 2);return tmp * tmp;}}vector<ll> compress(vector<ll>& v) {// [3 5 5 6 1 1 10 1] -> [1 2 2 3 0 0 4 0]vector<ll> u = v;sort(u.begin(), u.end());u.erase(unique(u.begin(),u.end()),u.end());map<ll, ll> mp;for (int i = 0; i < u.size(); i++) {mp[u[i]] = i;}for (int i = 0; i < v.size(); i++) {v[i] = mp[v[i]];}return v;}vector<ll> Eratosthenes( const ll N ){vector<bool> is_prime( N + 1 );for( ll i = 0; i <= N; i++ ){is_prime[ i ] = true;}vector<ll> P;for( ll i = 2; i <= N; i++ ){if( is_prime[ i ] ){for( ll j = 2 * i; j <= N; j += i ){is_prime[ j ] = false;}P.emplace_back( i );}}return P;}bool ok(int k, int h, int w, vector<vector<bool>>& black, vector<vector<int>>& cum) {vector<vector<int>> imos(h + 2, vector<int>(w + 2, 0));for (int i = 1; i + k - 1 <= h; i++) {for (int j = 1; j + k - 1 <= w; j++) {int num = cum[i - 1][j - 1] + cum[i + k - 1][j + k - 1] - cum[i - 1][j + k - 1] - cum[i + k - 1][j - 1];if (num == k * k) {imos[i][j]++;imos[i][j + k]--;imos[i + k][j]--;imos[i + k][j + k]++;}}}for (int i = 1; i <= h; i++) {for (int j = 1; j <= w; j++) {imos[i][j] += imos[i - 1][j];}}for (int i = 1; i <= h; i++) {for (int j = 1; j <= w; j++) {imos[i][j] += imos[i][j - 1];}}for (int i = 1; i <= h; i++) {for (int j = 1; j <= w; j++) {if (black[i][j] && (imos[i][j] == 0)) return false;if (!black[i][j] && (imos[i][j])) return false;}}return true;}int main() {int h, w;cin >> h >> w;vector<vector<bool>> black(h + 1, vector<bool>(w + 1, false));vector<vector<int>> cum(h + 1, vector<int>(w + 1, 0));for (int i = 1; i <= h; i++) {string s;cin >> s;for (int j = 1; j <= w; j++) {if (s[j - 1] == '#') {black[i][j] = true;cum[i][j] = cum[i - 1][j] + cum[i][j - 1] - cum[i - 1][j - 1] + 1;}else {cum[i][j] = cum[i - 1][j] + cum[i][j - 1] - cum[i - 1][j - 1];}}}int no = 2001;int yes = 1;while (no - yes > 1) {int mid = (no + yes) / 2;if (ok(mid, h, w, black, cum)) yes = mid;else no = mid;}cout << yes << '\n';return 0;}