Compilare: main.cpp: In function 'void dfs(int)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[a].size();i++) { ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:23:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d" ,&n); ^ main.cpp:25:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d" ,&gen[i]); ^ main.cpp:28:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d" ,&a ,&b); ^