View Compilation Error

0_0_17081600_18588.cpp: In function 'void bfs()':
0_0_17081600_18588.cpp:30:21: error: 'x' was not declared in this scope
     first.key = key[x][y];
                     ^
0_0_17081600_18588.cpp:30:24: error: 'y' was not declared in this scope
     first.key = key[x][y];
                        ^