Compilare: user.cpp: In function ‘bool DFS(int)’: user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ~^~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:36:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:40:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&X); ^