View Compilation Error

0_0_30432939_29552.cpp: In function 'int dijkstra(int, int, int)':
0_0_30432939_29552.cpp:8:29: error: 'memset' was not declared in this scope
  memset(dis,0x3f,sizeof(dis));
                             ^
0_0_30432939_29552.cpp: In function 'int main()':
0_0_30432939_29552.cpp:35:28: error: 'scanf' was not declared in this scope
  while(~scanf("%d %d",&n,&m)){
                            ^
0_0_30432939_29552.cpp:36:29: error: 'memset' was not declared in this scope
   memset(map,inf,sizeof(map));
                             ^
0_0_30432939_29552.cpp:44:38: error: 'printf' was not declared in this scope
   printf("%d\n",dijkstra(start,end,n));
                                      ^