View Compilation Error

0_0_35465732_24907.cpp: In function 'int main()':
0_0_35465732_24907.cpp:34:25: error: 'memset' was not declared in this scope
  memset(dp,-1,sizeof(dp));
                         ^
0_0_35465732_24907.cpp:39:3: error: 'cin' was not declared in this scope
   cin>>l>>r;
   ^