Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<graph[x].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:22:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&n,&m); ^ user.cpp:24:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&a,&b); ^