Compilare: user.cpp: In function ‘int main()’: user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < nowmax.size() ; ++i) ^ user.cpp:34:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm5.in" , "r" , stdin); ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm5.out" , "w" , stdout); ^ user.cpp:37:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^