Compilare: main.cpp: In function 'void dfs(int)': main.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<graf[nod].size(); ++j) ~^~~~~~~~~~~~~~~~~ main.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(fiu=0; fiu<graf[nod].size(); ++fiu) ~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n,&k); ^ main.cpp:52:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x,&y); ^