View Compilation Error

0_0_37697103_25721.cpp: In function 'int main()':
0_0_37697103_25721.cpp:10:11: error: 'cin' was not declared in this scope
     while(cin>>n>>k)
           ^
0_0_37697103_25721.cpp:13:29: error: 'memset' was not declared in this scope
         memset(a,0,sizeof(a));
                             ^
0_0_37697103_25721.cpp:33:9: error: 'cout' was not declared in this scope
         cout<<dp[n][k]<<endl;
         ^
0_0_37697103_25721.cpp:33:25: error: 'endl' was not declared in this scope
         cout<<dp[n][k]<<endl;
                         ^