getchar_unlocked and putchar_unlocked issue

getchar_unlocked and putchar_unlocked give me compilation error as not defined in this scope !

submitted with [gnu c++11]

submission : http://mirror.codeforces.com/contest/816/submission/28246567

please how to solve this problem i can use getchar and putchar instead but i want getchar_unlocked and putchar_unlocked because of its faster.