Compilare: main.cpp: In function 'int main()': main.cpp:22:50: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::unordered_set<int>::size_type {aka long unsigned int}' [-Wformat=] if(t==3) printf("%d\n",s.count(x)); ^ main.cpp:9:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in","r",stdin); ^ main.cpp:10:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out","w",stdout); ^ main.cpp:13:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:19:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&t,&x); ^