Submission #393445

#	Time	Username	Problem	Language	Result	Execution time	Memory
393445		inventiontime	Nautilus (BOI19_nautilus)	C++17	66 / 100	1092 ms	1196 KiB

nautilus

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

typedef pair<int, int> ii;

int R, C, M;
bool W[502][502] = {};
bool pos[502][502][2] = {};
queue<ii> pts;
string I;

int main() {
    cin >> R >> C >> M;

    char c;
    for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) {
        cin >> c;
        W[i][j] = c == '.';
        pos[i][j][1] = W[i][j];
    }

    cin >> I;
    for(int k = 0; k < M; k++)
        for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) if(W[i][j]) {
            switch(I[k]) {
                case 'N':
                pos[i][j][k % 2] = pos[i+1][j][(k % 2) ^ 1];
                break;

                case 'S':
                pos[i][j][k % 2] = pos[i-1][j][(k % 2) ^ 1];
                break;

                case 'E':
                pos[i][j][k % 2] = pos[i][j-1][(k % 2) ^ 1];
                break;

                case 'W':
                pos[i][j][k % 2] = pos[i][j+1][(k % 2) ^ 1];
                break;

                case '?':
                pos[i][j][k % 2] 
                    = pos[i][j-1][(k % 2) ^ 1]
                    | pos[i][j+1][(k % 2) ^ 1]
                    | pos[i-1][j][(k % 2) ^ 1]
                    | pos[i+1][j][(k % 2) ^ 1];
                break;
            }
        }

    int res = 0;
    for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) {
        if(pos[i][j][(M % 2) ^ 1])
            res++;
    }

    cout << res << endl;

    return 0;
}

/*
5 9 7
...##....
..#.##..#
..#....##
.##...#..
....#....
WS?EE??
*/

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