Submission #577937

#	Time	Username	Problem	Language	Result	Execution time	Memory
577937		MohamedFaresNebili	Nautilus (BOI19_nautilus)	C++14	100 / 100	114 ms	157188 KiB

nautilus

#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast")
#pragma GCC target ("avx2")

        using namespace std;

        using ll = long long;
        using ii = pair<ll, ll>;

        #define ff first
        #define ss second
        #define pb push_back

        const int oo = 1e9 + 7;

        int r, c, m;
        bitset<501> grid[502];
        bitset<501> dp[502][5001];

        int32_t main() {
            ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
            cin >> r >> c >> m;
            for(int l = 1; l <= r; l++) {
                for(int i = 1; i <= c; i++) {
                    char ch; cin >> ch;
                    if(ch == '.') grid[l][i] = 1;
                    dp[l][0][i] = grid[l][i];
                }
            }
            string s; cin >> s;
            for(int l = 1; l <= m; l++) {
                for(int i = 1; i <= r; i++) {
                    if(s[l - 1] == 'S') dp[i][l] = dp[i - 1][l - 1] & grid[i];
                    if(s[l - 1] == 'N') dp[i][l] = dp[i + 1][l - 1] & grid[i];
                    if(s[l - 1] == 'E') dp[i][l] = (dp[i][l - 1] << 1) & grid[i];
                    if(s[l - 1] == 'W') dp[i][l] = (dp[i][l - 1] >> 1) & grid[i];
                    if(s[l - 1] == '?')
                        dp[i][l] = (dp[i + 1][l - 1] | dp[i - 1][l - 1] | (dp[i][l - 1] << 1) | (dp[i][l - 1] >> 1)) & grid[i];
                }
            }
            int res = 0;
            for(int l = 1; l <= r; l++) res += dp[l][m].count();
            cout << res << "\n";
        }

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