View Compilation Error

0_0_32603352_10853.cpp: In function 'void dfs(int, int, int)':
0_0_32603352_10853.cpp:42:17: error: 'x1' was not declared in this scope
             dfs(x1,y1,step+1);
                 ^
0_0_32603352_10853.cpp:42:20: error: 'y1' was not declared in this scope
             dfs(x1,y1,step+1);
                    ^
0_0_32603352_10853.cpp:42:23: error: 'step' was not declared in this scope
             dfs(x1,y1,step+1);
                       ^
0_0_32603352_10853.cpp:45:13: error: 'maze' was not declared in this scope
             maze[x1][y1]='.';
             ^