View Compilation Error

0_0_17154336_30250.cpp:4:28: error: 'acos' was not declared in this scope
 const double PI = acos(-1.0);
                            ^
0_0_17154336_30250.cpp: In function 'int main()':
0_0_17154336_30250.cpp:11:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);
                  ^
0_0_17154336_30250.cpp:12:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_17154336_30250.cpp:35:51: error: 'printf' was not declared in this scope
             if(k < 0 || k > 30000) { printf("NO\n"); continue; }
                                                   ^
0_0_17154336_30250.cpp:36:46: error: 'printf' was not declared in this scope
             if(vis[k] == kase) printf("YES\n");
                                              ^
0_0_17154336_30250.cpp:37:31: error: 'printf' was not declared in this scope
             else printf("NO\n");
                               ^