Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:9:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i< v[nod].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < v[w[i]].size(); j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:21:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&n); ^ main.cpp:37:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d %d",&a,&b); ^