View Compilation Error

0_0_17802588_6365.cpp: In function 'int main()':
0_0_17802588_6365.cpp:60:8: error: 'x' was not declared in this scope
      r[x][ch-'0']=c[y][ch-'0']=b[x/3][y/3][ch-'0']=1;
        ^
0_0_17802588_6365.cpp:60:21: error: 'y' was not declared in this scope
      r[x][ch-'0']=c[y][ch-'0']=b[x/3][y/3][ch-'0']=1;
                     ^
0_0_17802588_6365.cpp:77:7: error: 'x' was not declared in this scope
     r[x][ch-'0']=c[y][ch-'0']=b[x/3][y/3][ch-'0']=1;
       ^
0_0_17802588_6365.cpp:77:20: error: 'y' was not declared in this scope
     r[x][ch-'0']=c[y][ch-'0']=b[x/3][y/3][ch-'0']=1;
                    ^