Submission #141282

#	Time	Username	Problem	Language	Result	Execution time	Memory
141282		meatrow	Collecting Mushrooms (NOI18_collectmushrooms)	C++17	100 / 100	29 ms	11624 KiB

mushrooms

//#pragma GCC optimize("O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,tune=native")
//#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

vector<vector<int>> f, s;
int r, c, d, k;

void add(int x, int y) {
    int x1 = max(1, x - d);
    int y1 = max(1, y - d);
    int x2 = x + d + 1;
    int y2 = y + d + 1;
    f[x1][y1]++;
    if (y2 <= c) {
        f[x1][y2]--;
    }
    if (x2 <= r) {
        f[x2][y1]--;
    }
    if (x2 <= r && y2 <= c) {
        f[x2][y2]++;
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cin >> r >> c >> d >> k;
    vector<vector<char>> field(r + 1, vector<char>(c + 1));
    f.assign(r + 1, vector<int>(c + 1, 0));
    s.assign(r + 1, vector<int>(c + 1, 0));
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            cin >> field[i][j];
            if (field[i][j] == 'S') {
                add(i, j);
            } 
        }
    }
    int ans = 0;
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + f[i][j];
            if (field[i][j] == 'M' && s[i][j] >= k) {
                ans++;
            }
        }
    }
    cout << ans;
    return 0;
}

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