Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L[nod].size();i++){ ^ user.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i+1<s.size() && modul(s[i]+s[i+1])>k ){ ^ user.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i<s.size() && modul(s[i])>k ){ ^ user.cpp:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size()){ ^ user.cpp: In function ‘int main()’: user.cpp:42:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&k); ^ user.cpp:44:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&b); ^