Compilare: user.cpp: In function ‘void solve()’: user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < divi.size(); ++i){ ^ user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j < divi.size(); ++j){ ^ user.cpp: In function ‘void print()’: user.cpp:39:30: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘std::set<std::pair<long long int, long long int> >::size_type {aka long unsigned int}’ [-Wformat=] printf("%d\n", sol.size()); ^ user.cpp: In function ‘int main()’: user.cpp:46:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in", "r", stdin); ^ user.cpp:47:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out", "w", stdout); ^ user.cpp:48:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b); ^