Submission #1151739

#	Time	Username	Problem	Language	Result	Execution time	Memory
1151739		arafatenok	Collecting Mushrooms (NOI18_collectmushrooms)	C++17	100 / 100	10 ms	9032 KiB

mushrooms

#include <bits/stdc++.h>
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("avx,avx2,fma")
// #pragma GCC optimization("unroll-loops")
// #pragma ("reroll")
#define skip continue;
#define gold ios_base::sync_with_stdio(false);cin.tie(NULL);
#define xa "\n"
#define int long long
#define all(a) a.begin(), a.end()
#define pb push_back
#define F first
#define S second
using namespace std;

const int mod = 1e9 + 7;
const int N = 1e6 + 7;
const int MAX = 1e9;
const int inf = 1e18;

int gcd(int a, int b) { if (b == 0) return a; else if(a == 0) return b; else return gcd(b, a % b); }
int lcm(int a, int b) { return a / gcd(a, b) * b; }

void solve() {
    int n, m, d, k;
    cin >> n >> m >> d >> k;
    char x[n + 1][m + 1];
    int pref[n + 1][m + 1];
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> x[i][j];
            pref[i][j] = pref[i - 1][j] + pref[i][j - 1] - pref[i - 1][j - 1] + (x[i][j] == 'S');
        }
    }
    int ans = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            int x1 = max(i - d, 1ll);
            int y1 = max(j - d, 1ll);
            int x2 = min(i + d, n);
            int y2 = min(j + d, m);
            int sum = pref[x2][y2] - pref[x1 - 1][y2] - pref[x2][y1 - 1] + pref[x1 - 1][y1 - 1];
            if(x[i][j] == 'M' && sum >= k) ans++;
        }
    }
    cout << ans;
}

signed main() {
    gold;
    //freopen("rmq.in", "r", stdin);
    //freopen("rmq.out", "w", stdout);
    int t = 1;
    int ti = 1;
    //cin >> t;
    while (t--) {
        //cout << "Case " << ti << ": ";
        solve();
        ti++;
    }
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 23 / 23
• Subtask 5: 19 / 19
• Subtask 6: 21 / 21