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:90:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < ret.size()) ret[ins++] = ret[j++]; ^ user.cpp: In function ‘int main()’: user.cpp:100:34: 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:101:36: 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:103:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &S); ^ user.cpp:104:48: 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]); ^