Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:9:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:20:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d" ,&n,&m); ^ user.cpp:22:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%f" ,&val[i]); ^ user.cpp:24:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&x); ^ user.cpp:39:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %f " ,&x,&y); ^ user.cpp:32:14: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] DFS(root); ^