Submission #443581

#	Time	Username	Problem	Language	Result	Execution time	Memory
443581		JovanB	Nautilus (BOI19_nautilus)	C++17	100 / 100	85 ms	452 KiB

nautilus

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ld = long double;

bitset <500> dpp[505];
bitset <500> dp[505];
bitset <500> rows[505];

int main(){
    ios_base::sync_with_stdio(false), cin.tie(0);
    cout.precision(10);
    cout << fixed;

    int n, m, k;
    cin >> n >> m >> k;
    for(int i=1; i<=n; i++){
        string s;
        cin >> s;
        for(int j=0; j<m; j++){
            if(s[j] == '.') dp[i][j] = rows[i][j] = 1;
        }
    }
    while(k--){
        for(int i=1; i<=n; i++) dpp[i] = dp[i];
        char c;
        cin >> c;
        if(c == 'W'){
            for(int i=1; i<=n; i++) dp[i] = (dpp[i] >> 1);
        }
        else if(c == 'E'){
            for(int i=1; i<=n; i++) dp[i] = (dpp[i] << 1);
        }
        else if(c == 'N'){
            for(int i=1; i<=n; i++) dp[i] = dpp[i+1];
        }
        else if(c == 'S'){
            for(int i=1; i<=n; i++) dp[i] = dpp[i-1];
        }
        else{
            for(int i=1; i<=n; i++) dp[i] = (dpp[i] << 1);
            for(int i=1; i<=n; i++) dp[i] |= (dpp[i] >> 1);
            for(int i=1; i<=n; i++) dp[i] |= dpp[i+1];
            for(int i=1; i<=n; i++) dp[i] |= dpp[i-1];
        }
        for(int i=1; i<=n; i++) dp[i] &= rows[i];
    }
    int res = 0;
    for(int i=1; i<=n; i++){
        res += dp[i].count();
    }
    cout << res << "\n";
    return 0;
}

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