View Compilation Error

0_0_28382892_15452.cpp: In function 'int main()':
0_0_28382892_15452.cpp:16:17: error: 'i' was not declared in this scope
                 i=n/1000000;
                 ^
0_0_28382892_15452.cpp:22:20: error: 'b' was not declared in this scope
                 if(b[n]){
                    ^