View Compilation Error

0_0_29127909_10971.cpp: In function 'int main()':
0_0_29127909_10971.cpp:15:13: error: expected ';' before 'problem'
             problem[i]=a+b;
             ^
0_0_29127909_10971.cpp:24:15: error: 'i' was not declared in this scope
         cout<<i<<endl;
               ^