Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<v[k].size()){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:30:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&n,&m); ^ main.cpp:32:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&a,&b); ^