Compilare: user.cpp: In function ‘bool formnumber(std::vector<int>&)’: user.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < nr.size (); ++ i) ^ user.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < nr.size (); ++ i) ^ user.cpp: In function ‘void backtracking(std::vector<int>&)’: user.cpp:40:15: warning: unused variable ‘h’ [-Wunused-variable] long long h; ^ user.cpp: In function ‘void preg()’: user.cpp:58:12: warning: unused variable ‘l’ [-Wunused-variable] int i, l, minim, ind2; ^ user.cpp:58:15: warning: unused variable ‘minim’ [-Wunused-variable] int i, l, minim, ind2; ^ user.cpp:58:22: warning: unused variable ‘ind2’ [-Wunused-variable] int i, l, minim, ind2; ^ user.cpp:60:12: warning: unused variable ‘lungime’ [-Wunused-variable] double lungime; ^ user.cpp: In function ‘int binarySearch(const int&)’: user.cpp:79:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + step < ans2.size () && ans2 [i + step] < value) ^ user.cpp: In function ‘int main()’: user.cpp:87:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("kpal.in", "r", stdin); ^ user.cpp:88:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("kpal.out", "w", stdout); ^ user.cpp:90:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &k); ^ user.cpp:92:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &b [i]); ^ user.cpp:95:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &q); ^ user.cpp:98:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &l, &u); ^