View Compilation Error

0_0_34625322_4558.cpp: In function 'int main()':
0_0_34625322_4558.cpp:17:13: error: 'b' was not declared in this scope
             b[a1]=b1;
             ^
0_0_34625322_4558.cpp:19:15: error: 'b' was not declared in this scope
         dp[1]=b[1];
               ^