Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:19:34: warning: left operand of comma operator has no effect [-Wunused-value] for(it=arr[nr].begin();as!=1,it!=arr[nr].end();it++) ^ user.cpp: In function ‘int main()’: user.cpp:37:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&v,&e); ^ user.cpp:41:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&p1,&p2); ^ user.cpp:45:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&q); ^ user.cpp:48:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&target,&length); ^