Submission #493002

#	Time	Username	Problem	Language	Result	Execution time	Memory
493002		wiwiho	Nautilus (BOI19_nautilus)	C++14	66 / 100	1075 ms	1484 KiB

nautilus

#include <bits/stdc++.h>

using namespace std;

const int SZ = 5002;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cerr.tie(0);

    int r, c, m;
    cin >> r >> c >> m;

    vector<bitset<SZ>> g(r + 2);
    for(int i = 1; i <= r; i++){
        string t;
        cin >> t;
        for(int j = 0; j < c; j++){
            if(t[j] == '.') g[i][c - j] = 1;
        }
        //cerr << t << "\n";
        //cerr << g[i] << "\n";
    }

    //for(int i = 0; i <= r + 1; i++) cerr << g[i] << "\n";

    string s;
    cin >> s;
    
    vector<vector<bitset<SZ>>> dp(2, vector<bitset<SZ>>(r + 2));
    int now = 0;
    dp[now] = g;

    for(char d : s){
        now = !now;
        for(int i = 1; i <= r; i++) dp[now][i].reset();
        
        if(d == 'S' || d == '?'){
            for(int i = 1; i <= r; i++) dp[now][i] |= dp[!now][i - 1];
        }
        if(d == 'N' || d == '?'){
            for(int i = 1; i <= r; i++) dp[now][i] |= dp[!now][i + 1];
        }
        if(d == 'E' || d == '?'){
            for(int i = 1; i <= r; i++) dp[now][i] |= dp[!now][i] >> 1;
        }
        if(d == 'W' || d == '?'){
            for(int i = 1; i <= r; i++) dp[now][i] |= dp[!now][i] << 1;
        }
        //cerr << "test " << d << "\n";
        //for(int i = 0; i <= r + 1; i++) cerr << dp2[i] << "\n";

        for(int i = 1; i <= r; i++) dp[now][i] &= g[i];

        //cerr << "test " << d << "\n";
        //for(int i = 0; i <= r + 1; i++) cerr << dp[i] << "\n";
    }

    int ans = 0;
    for(int i = 1; i <= r; i++){
        for(int j = 1; j <= c; j++){
            if(dp[now][i][j]) ans++;
        }
    }
    cout << ans << "\n";

    return 0;
}

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