Compilare: user.cpp: In function ‘int main()’: user.cpp:48:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[vecin].size();j++) ^ user.cpp:20:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d\n", &n, &k); ^ user.cpp:23:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d\n", &x, &y); ^