Submission #1091741

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091741		gyg	Nautilus (BOI19_nautilus)	C++17	100 / 100	41 ms	604 KiB

nautilus

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

int r, c, n;
arr<bset<MX_C>, MX_R> fr;
arr<char, MX_N> mv;

arr<arr<bset<MX_C>, MX_R>, 2> ps;
void cmp() {
    for (int i = 1; i <= r; i++)
        for (int j = 1; j <= c; j++) ps[0][i][j] = fr[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++)
                ps[prty][j] = fr[j] & (ps[opp_prty][j] >> 1);
        }
        if (mv[i] == 'E') {
            for (int j = 1; j <= r; j++)
                ps[prty][j] = fr[j] & (ps[opp_prty][j] << 1);
        }
        if (mv[i] == 'S') {
            for (int j = 1; j <= r; j++)
                ps[prty][j] = fr[j] & ps[opp_prty][j - 1];
        }
        if (mv[i] == 'N') {
            for (int j = 1; j <= r; j++)
                ps[prty][j] = fr[j] & ps[opp_prty][j + 1];
        }
        if (mv[i] == '?') {
            for (int j = 1; j <= r; j++)
                ps[prty][j] = fr[j] & ((ps[opp_prty][j] >> 1) | (ps[opp_prty][j] << 1) | ps[opp_prty][j - 1] | ps[opp_prty][j + 1]);
        }
 
        // 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;
            fr[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: 34 / 34