View Compilation Error

0_0_17925788_7075.cpp: In function 'void task()':
0_0_17925788_7075.cpp:31:27: error: 'memset' was not declared in this scope
     memset(dp,0,sizeof(dp));    
                           ^
0_0_17925788_7075.cpp:51:5: error: 'cout' was not declared in this scope
     cout<<ans<<endl;    
     ^
0_0_17925788_7075.cpp:51:16: error: 'endl' was not declared in this scope
     cout<<ans<<endl;    
                ^