Compilare: user.cpp: In function ‘int main()’: user.cpp:54:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<L[nod].size(); i++) ^ user.cpp:16:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ user.cpp:20:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &x, &y, &z); ^