Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();i++) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gt[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:55:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&n); ^ user.cpp:57:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&v[i]); ^ user.cpp:60:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&k); ^ user.cpp:63:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&x); ^