View Compilation Error

0_0_17366355_16750.cpp: In function 'void dfs(int, int, int)':
0_0_17366355_16750.cpp:37:15: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
    maze[x][y] = "."
               ^
0_0_17366355_16750.cpp:38:3: error: expected ';' before '}' token
   }
   ^