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  1. #pragma GCC optimize("Ofast")
  2. #pragma GCC target("sse4")
  3. #include <cstdio>
  4. #include <cstring>
  5. using namespace std;
  6. int r,c,m;
  7. const int N = 502, M = 5000;
  8. bool reach[N][N],tmp[N][N],sea[N][N];
  9. char grid[N][N], msg[M];
  10. int main(){
  11.     scanf("%d %d %d",&r,&c,&m);
  12.     for(int i = 1; i <= r; ++i)
  13.         scanf("%s",grid[i]+1);
  14.     scanf("%s",msg);
  15.     for(int i = 1; i <= r; ++i)
  16.         for(int j = 1; j <= c; ++j){
  17.             sea[i][j] = grid[i][j] == '.';
  18.             reach[i][j] = grid[i][j] == '.';
  19.         }
  20.     for(char w : msg){
  21.         if(w == 'W')
  22.             for(int i = 1; i <= r; ++i){
  23.                 for(int j = 1; j <= c-1; ++j)
  24.                     reach[i][j] = reach[i][j+1] & sea[i][j];
  25.                 reach[i][c] = 0;
  26.             }
  27.         if(w == 'E')
  28.             for(int i = 1; i <= r; ++i){
  29.                 for(int j = c; j > 1; --j)
  30.                     reach[i][j] = reach[i][j-1] & sea[i][j];
  31.                 reach[i][1] = 0;
  32.             }
  33.         if(w == 'N'){
  34.             for(int i = 1; i <= r-1; ++i)
  35.                 for(int j = 1; j <= c; ++j)
  36.                     reach[i][j] = reach[i+1][j] & sea[i][j];
  37.             memset(reach[r], 0, sizeof reach[0]);
  38.         }
  39.         if(w == 'S'){
  40.             for(int i = r; i > 1; --i)
  41.                 for(int j = 1; j <= c; ++j)
  42.                     reach[i][j] = reach[i-1][j] & sea[i][j];
  43.             memset(reach[1], 0, sizeof reach[0]);
  44.         }
  45.         if(w == '?'){
  46.             for(int i = 1; i <= r; ++i)
  47.                 for(int j = 1; j <= c; ++j)
  48.                     tmp[i][j] = (reach[i-1][j]|reach[i+1][j]|reach[i][j-1]|reach[i][j+1])&sea[i][j];
  49.             memmove(reach, tmp, sizeof tmp);
  50.         }
  51.     }
  52.     int ans = 0;
  53.     for(int i = 1; i <= r; ++i)
  54.         for(int j = 1; j <= c; ++j)
  55.             ans += reach[i][j];
  56.     printf("%d\n",ans);
  57. }
  58.  
Success #stdin #stdout 0s 16232KB
comments (?)
stdin
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5 9 7
...##....
..#.##..#
..#....##
.##...#..
....#....
WS?EE??
stdout
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22
https://ideone.com/Xf7Ybh
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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