Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<w[nod].size();j++){ ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:59:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ user.cpp:61:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^