Compilare: user.cpp: In function ‘void DFS1(int)’: user.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:23:18: 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:49:33: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘std::vector<int>::size_type {aka long unsigned int}’ [-Wformat=] fprintf(OUT,"%d\n",o1.size()); ^ user.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<o1.size();i++) ^ user.cpp:52:35: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘std::vector<int>::size_type {aka long unsigned int}’ [-Wformat=] fprintf(OUT,"\n%d\n",o2.size()); ^ user.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<o2.size();i++) ^ user.cpp:36:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&M); ^ user.cpp:39:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&Y); ^