結果

問題 No.2456 Stamp Art
ユーザー au7777au7777
提出日時 2023-09-14 14:49:24
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 408 ms / 5,000 ms
コード長 4,402 bytes
コンパイル時間 4,876 ms
コンパイル使用メモリ 244,140 KB
実行使用メモリ 35,328 KB
最終ジャッジ日時 2023-09-14 14:49:38
合計ジャッジ時間 13,214 ms
ジャッジサーバーID
（参考情報） 		judge11 / judge14
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
4,376 KB
testcase_01 AC 2 ms
4,376 KB
testcase_02 AC 2 ms
4,380 KB
testcase_03 AC 335 ms
35,220 KB
testcase_04 AC 1 ms
4,380 KB
testcase_05 AC 2 ms
4,380 KB
testcase_06 AC 361 ms
35,328 KB
testcase_07 AC 343 ms
35,172 KB
testcase_08 AC 302 ms
35,236 KB
testcase_09 AC 358 ms
35,180 KB
testcase_10 AC 374 ms
35,132 KB
testcase_11 AC 336 ms
35,284 KB
testcase_12 AC 339 ms
35,184 KB
testcase_13 AC 408 ms
35,328 KB
testcase_14 AC 385 ms
35,276 KB
testcase_15 AC 340 ms
35,240 KB
testcase_16 AC 167 ms
19,120 KB
testcase_17 AC 2 ms
4,376 KB
testcase_18 AC 2 ms
4,376 KB
testcase_19 AC 202 ms
24,476 KB
testcase_20 AC 351 ms
35,328 KB
testcase_21 AC 340 ms
32,208 KB
testcase_22 AC 365 ms
35,224 KB
testcase_23 AC 17 ms
4,844 KB
testcase_24 AC 28 ms
5,668 KB
testcase_25 AC 2 ms
4,380 KB
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 # 

#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 USE998244353
const ll MOD = 998244353;
// const double PI = 3.1415926535897932;
using mint = modint998244353;
#else
const ll MOD = 1000000007;
using mint = modint1000000007;
#endif
const 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 > 0
    ll 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;
}
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