Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<l[nod].size();i++){ ^ user.cpp: In function ‘void dfsinvers(int, int)’: user.cpp:53:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<l[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:66:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ user.cpp:69:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^