Submission #493001

#	Time	Username	Problem	Language	Result	Execution time	Memory
493001		wiwiho	Nautilus (BOI19_nautilus)	C++14	66 / 100	1090 ms	1364 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<bitset<SZ>> dp = g;

    for(char d : s){
        vector<bitset<SZ>> dp2(r + 2);
        
        if(d == 'S' || d == '?'){
            for(int i = 1; i <= r; i++) dp2[i] |= dp[i - 1];
        }
        if(d == 'N' || d == '?'){
            for(int i = 1; i <= r; i++) dp2[i] |= dp[i + 1];
        }
        if(d == 'E' || d == '?'){
            for(int i = 1; i <= r; i++) dp2[i] |= dp[i] >> 1;
        }
        if(d == 'W' || d == '?'){
            for(int i = 1; i <= r; i++) dp2[i] |= dp[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++) dp2[i] &= g[i];

        dp.swap(dp2);

        //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[i][j]) ans++;
        }
    }
    cout << ans << "\n";

    return 0;
}

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