Submission #1091589

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091589		gyg	Nautilus (BOI19_nautilus)	C++17	66 / 100	1054 ms	1624 KiB

nautilus

#pragma GCC optimize("Ofast", "unroll-loops")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;
#define arr array
const int MX_R = 5e2 + 5, MX_C = 5e2 + 5, MX_N = 5e3 + 5;

int r, c, n;
bool wll[MX_R][MX_C];
arr<char, MX_N> mv;

bool ps[2][MX_R][MX_C];
void cmp() {
    for (int i = 1; i <= r; i++)
        for (int j = 1; j <= c; j++)
            ps[0][i][j] = !wll[i][j];
    
    for (int i = 1; i <= n; i++) {
        int prty = i % 2, opp_prty = (i + 1) % 2;
        if (mv[i] == 'W') {
            for (int j = 1; j <= r; j++)
                for (int k = 1; k <= c; k++)
                    ps[prty][j][k] = !wll[j][k] && ps[opp_prty][j][k + 1];
        }
        if (mv[i] == 'E') {
            for (int j = 1; j <= r; j++)
                for (int k = 1; k <= c; k++)
                    ps[prty][j][k] = !wll[j][k] && ps[opp_prty][j][k - 1];
        }
        if (mv[i] == 'S') {
            for (int j = 1; j <= r; j++)
                for (int k = 1; k <= c; k++)
                    ps[prty][j][k] = !wll[j][k] && ps[opp_prty][j - 1][k];
        }
        if (mv[i] == 'N') {
            for (int j = 1; j <= r; j++)
                for (int k = 1; k <= c; k++)
                    ps[prty][j][k] = !wll[j][k] && ps[opp_prty][j + 1][k];
        }
        if (mv[i] == '?') {
            for (int j = 1; j <= r; j++)
                for (int k = 1; k <= c; k++)
                    ps[prty][j][k] = !wll[j][k] && (ps[opp_prty][j][k + 1] || ps[opp_prty][j][k - 1] || ps[opp_prty][j + 1][k] || ps[opp_prty][j - 1][k]);
        }

        // cout << mv[i] << ": " << "----------------" << endl;
        // for (int j = 1; j <= r; j++) {
        //     for (int k = 1; k <= c; k++) cout << ps[prty][j][k];
        //     cout << endl;
        // }
    }
}

int main() {
    // freopen("nt.in", "r", stdin);
    cin.sync_with_stdio(false), cin.tie(0);
    cin >> r >> c >> n;
    for (int i = 1; i <= r; i++) {
        for (int j = 1; j <= c; j++) {
            char x; cin >> x;
            wll[i][j] = (x == '#');
        }
    }
    for (int i = 1; i <= n; i++) cin >> mv[i];

    cmp();
    int ans = 0;
    for (int i = 1; i <= r; i++)
        for (int j = 1; j <= c; j++) ans += ps[n % 2][i][j];
    cout << ans << endl;
}

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34