View Compilation Error

0_0_17560564_7323.cpp: In function 'int main()':
0_0_17560564_7323.cpp:3:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_17560564_7323.cpp:3:10: error: 't' was not declared in this scope
     cin>>t;
          ^
0_0_17560564_7323.cpp:8:16: error: 'dp' was not declared in this scope
         memset(dp,0,sizeof(dp));
                ^
0_0_17560564_7323.cpp:8:31: error: 'memset' was not declared in this scope
         memset(dp,0,sizeof(dp));
                               ^
0_0_17560564_7323.cpp:9:16: error: 'b' was not declared in this scope
         memset(b,0,sizeof(b));
                ^
0_0_17560564_7323.cpp:12:18: error: 'a' was not declared in this scope
             cin>>a[i];
                  ^
0_0_17560564_7323.cpp:15:15: error: 'a' was not declared in this scope
         b[ll]=a[1],b[rr]=a[1];
               ^
0_0_17560564_7323.cpp:53:10: error: 'cout' was not declared in this scope
          cout<<len<<endl;
          ^
0_0_17560564_7323.cpp:53:21: error: 'endl' was not declared in this scope
          cout<<len<<endl;
                     ^