View Compilation Error

0_0_16207103_32268.cpp:21:1: error: 'map' does not name a type
 map<int,int> mp;
 ^
0_0_16207103_32268.cpp: In function 'int getans(int)':
0_0_16207103_32268.cpp:39:1: error: 'map' was not declared in this scope
 map<int,int>::iterator it = mp.find(n);
 ^
0_0_16207103_32268.cpp:39:5: error: expected primary-expression before 'int'
 map<int,int>::iterator it = mp.find(n);
     ^
0_0_16207103_32268.cpp:40:5: error: 'it' was not declared in this scope
 if (it != mp.end())  return it->second;
     ^
0_0_16207103_32268.cpp:40:11: error: 'mp' was not declared in this scope
 if (it != mp.end())  return it->second;
           ^
0_0_16207103_32268.cpp:47:1: error: 'mp' was not declared in this scope
 mp.insert(pair<int,int>(n,r));
 ^