Submission #1288603

#	Time	Username	Problem	Language	Result	Execution time	Memory
1288603		Hamed_Ghaffari	Nautilus (BOI19_nautilus)	C++20	100 / 100	156 ms	724 KiB

nautilus

#include <bits/stdc++.h>
using namespace std;

int r, c, m;
bitset<500> bs[2][500], fr[500];

int32_t main() {
    cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
    cin >> r >> c >> m;
    for(int i=0; i<r; i++) {
        for(int j=0; j<c; j++) {
            char x;
            cin >> x;
            bs[0][i][j] = fr[i][j] = x=='.';
        }
    }
    string s;
    cin >> s;
    int t=0;
    for(char x : s) {
        for(int i=0; i<r; i++) bs[t^1][i] = 0;
        if(x=='N' || x=='?') {
            for(int i=1; i<r; i++)
                bs[t^1][i-1] |= bs[t][i];
        }
        if(x=='E' || x=='?') {
            for(int i=0; i<r; i++)
                bs[t^1][i] |= bs[t][i]<<1;
        }
        if(x=='S' || x=='?') {
            for(int i=0; i+1<r; i++)
                bs[t^1][i+1] |= bs[t][i];
        }
        if(x=='W' || x=='?') {
            for(int i=0; i<r; i++)
                bs[t^1][i] |= bs[t][i]>>1;
        }
        for(int i=0; i<r; i++) bs[t^1][i] &= fr[i];
        t ^= 1;
    }
    int ans = 0;
    for(int i=0; i<r; i++)
        for(int j=0; j<c; j++)
            ans += bs[t][i][j];
    cout << ans << '\n';
    return 0;
}

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