Compilare: user.cpp: In function ‘void get_count()’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l < first_two.size() && r >= 0) { ^ user.cpp:45:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(++new_l == first_two.size()) break; ^ user.cpp: In function ‘void rm_value(std::vector<int>&, int)’: user.cpp:82:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = j; i < ret.size(); i++) aux2.pb(ret[i]); ^ user.cpp: In function ‘int main()’: user.cpp:93:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("take5.in","r",stdin); ^ user.cpp:94:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("take5.out","w",stdout); ^ user.cpp:96:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &S); ^ user.cpp:97:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 1; i <= n; i++) scanf("%d", &v[i]); ^