View Compilation Error

0_0_37206148_32463.cpp: In function 'int main()':
0_0_37206148_32463.cpp:33:7: error: 'x' was not declared in this scope
   vis[x][y][z] = 1;
       ^
0_0_37206148_32463.cpp:33:10: error: 'y' was not declared in this scope
   vis[x][y][z] = 1;
          ^
0_0_37206148_32463.cpp:33:13: error: 'z' was not declared in this scope
   vis[x][y][z] = 1;
             ^