View Compilation Error

0_0_25348744_6435.cpp: In function 'int main()':
0_0_25348744_6435.cpp:22:16: error: 'x' was not declared in this scope
     if(t[n]==a[x][m]-48)
                ^
0_0_25348744_6435.cpp:26:19: error: 'y' was not declared in this scope
     if(t[n]==a[m][y]-48)
                   ^
0_0_25348744_6435.cpp:28:14: error: 'x' was not declared in this scope
     int  u=((x-1)/3)*3;
              ^
0_0_25348744_6435.cpp:29:14: error: 'y' was not declared in this scope
     int  v=((y-1)/3)*3;
              ^