Compilare: user.cpp: In function ‘void solve()’: user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < diviz.size(); i++) ^ user.cpp:27:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i; j < diviz.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:47:39: 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:48:41: 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:50:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b); ^