Compilare: user.cpp: In function ‘int main()’: user.cpp:39:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < perechi.size(); ++i) { ^ user.cpp:53:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind < perechi.size()) { ^ user.cpp:25:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:29:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^