View Compilation Error

0_0_24897826_19586.cpp: In function 'void init()':
0_0_24897826_19586.cpp:8:30: error: 'memset' was not declared in this scope
         memset(h,-1,sizeof(h));  
                              ^
0_0_24897826_19586.cpp: In function 'int main()':
0_0_24897826_19586.cpp:22:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);  
                  ^
0_0_24897826_19586.cpp:32:26: error: 'puts' was not declared in this scope
         if(ans)puts("YES");else puts("NO");  
                          ^
0_0_24897826_19586.cpp:32:42: error: 'puts' was not declared in this scope
         if(ans)puts("YES");else puts("NO");  
                                          ^