Compilare: user.cpp: In function ‘int main()’: user.cpp:42:30: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘std::vector<long int>::size_type {aka unsigned int}’ [-Wformat=] printf("%ld\n",sel.size()); ^ user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sel.size();i++) printf("%ld ",E[sel[i]].size()); printf("\n"); ^ user.cpp:43:61: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘std::vector<long int>::size_type {aka unsigned int}’ [-Wformat=] for(i=0;i<sel.size();i++) printf("%ld ",E[sel[i]].size()); printf("\n"); ^ user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs2.in","r",stdin); ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs2.out","w",stdout); ^ user.cpp:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:33:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&jud,&id); ^