Compilare: user.cpp: In function ‘void DFS1(int)’: user.cpp:10:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp:26:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[x].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[1].size();i++) ^ user.cpp:37:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:39:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&x,&y); ^