Compilare: user.cpp: In function ‘int Solve(std::vector<std::vector<std::pair<int, int> > >&, int*, int, int*, bool*)’: user.cpp:83:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < f.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:114:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^