Main.cc:3:51: error: conflicting declaration ‘int b’
3 | int n,m,a[999999][999999],b[999999][999999],i,j,k,b;
| ^
Main.cc:3:27: note: previous declaration as ‘int b [999999][999999]’
3 | int n,m,a[999999][999999],b[999999][999999],i,j,k,b;
| ^
Main.cc: In function ‘int main()’:
Main.cc:8:11: error: incompatible types in assignment of ‘int’ to ‘int [999999][999999]’
8 | b=0;
| ^
Main.cc:22:19: error: lvalue required as increment operand
22 | b++;
| ^~