View Compilation Error

0_0_23243975_19205.cpp: In function 'int bfs()':
0_0_23243975_19205.cpp:30:15: error: '_x1' was not declared in this scope
     isVisited[_x1][__y1][_z1] = true;
               ^
0_0_23243975_19205.cpp:30:20: error: '__y1' was not declared in this scope
     isVisited[_x1][__y1][_z1] = true;
                    ^
0_0_23243975_19205.cpp:30:26: error: '_z1' was not declared in this scope
     isVisited[_x1][__y1][_z1] = true;
                          ^
0_0_23243975_19205.cpp: In function 'int main()':
0_0_23243975_19205.cpp:65:16: error: '__y1' was not declared in this scope
         cin >> __y1 >> _x1 >> _z1;  // mind the order of input...
                ^
0_0_23243975_19205.cpp:65:24: error: '_x1' was not declared in this scope
         cin >> __y1 >> _x1 >> _z1;  // mind the order of input...
                        ^
0_0_23243975_19205.cpp:65:31: error: '_z1' was not declared in this scope
         cin >> __y1 >> _x1 >> _z1;  // mind the order of input...
                               ^