Submission #1105782

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105782		vjudge1	Nautilus (BOI19_nautilus)	C++17	100 / 100	134 ms	1208 KiB

nautilus

#include <bits/stdc++.h>

const int N = 505;

int dx[] = {0, 0, -1, 1};
int dy[] = {-1, 1, 0, 0};

int main() {
    std::ios_base::sync_with_stdio(false); 
    std::cin.tie(nullptr);

    int r, c, m;
    std::string s;
    std::cin >> r >> c >> m;
    std::vector<std::vector<char>> a(r + 1, std::vector<char>(c + 1));
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            std::cin >> a[i][j];
        }
    }
    std::cin >> s;
    s = "#" + s;
    std::vector<std::bitset<N>> can(r + 2), good(r + 2);
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            if (a[i][j] == '.') {
                can[i][j] = 1;
                good[i][j] = 1;
            }
        }
    }
    for (int it = 1; it <= m; it++) {
        std::vector<std::bitset<N>> aux(r + 2);
        for (int i = 1; i <= r; ++i) {
            if (s[it] == '?') {
                aux[i] = can[i - 1] | can[i + 1];
                aux[i] |= can[i] << 1;
                aux[i] |= can[i] >> 1;
            }
            if (s[it] == 'W') {
                aux[i] = can[i] >> 1;
            } 
            if (s[it] == 'E') {
                aux[i] = can[i] << 1;
            }
            if (s[it] == 'N') {
                aux[i] = can[i + 1];
            }
            if (s[it] == 'S') {
                aux[i] = can[i - 1];
            }
            aux[i] &= good[i];
        }
        swap(can, aux);
    }
    int res = 0;
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            if (can[i][j] == 1) {
                res++;
            }
        }
    }
    std::cout << res << "\n";
    return 0;
}

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 34 / 34