View Compilation Error

0_0_30471931_6855.cpp: In function 'int main()':
0_0_30471931_6855.cpp:64:31: error: 'scanf' was not declared in this scope
     while(scanf("%d%d", &n, &m), n || m) {
                               ^
0_0_30471931_6855.cpp:73:27: error: 'printf' was not declared in this scope
         printf("%d\n", ans);
                           ^
0_0_30471931_6855.cpp: In instantiation of 'void Link<N, M, T>::clear() [with int N = 4101; int M = 8197; T = int]':
0_0_30471931_6855.cpp:44:13:   required from here
0_0_30471931_6855.cpp:2:41: error: 'memset' was not declared in this scope
 #define mset(a, b) memset(a, b, sizeof a)
                                         ^
0_0_30471931_6855.cpp:16:19: note: in expansion of macro 'mset'
     void clear() {mset(HEAD, 0); tot = 0;}
                   ^