View Compilation Error

0_0_29762294_18386.cpp: In function 'int main()':
0_0_29762294_18386.cpp:35:40: error: 'b' was not declared in this scope
                                 if(a[k+b][l-a]==1 && a[i+b][j-a]==1 ) sum++;
                                        ^
0_0_29762294_18386.cpp:35:45: error: invalid operands of types 'int' and 'int [405][405]' to binary 'operator-'
                                 if(a[k+b][l-a]==1 && a[i+b][j-a]==1 ) sum++;
                                             ^
0_0_29762294_18386.cpp:35:63: error: invalid operands of types 'int' and 'int [405][405]' to binary 'operator-'
                                 if(a[k+b][l-a]==1 && a[i+b][j-a]==1 ) sum++;
                                                               ^