Compilare: user.cpp: In function ‘void dfs2(int, int)’: user.cpp:31:9: warning: unused variable ‘frunza’ [-Wunused-variable] int frunza=1,p,k,lpr2,vf; ^~~~~~ user.cpp: In function ‘int main()’: user.cpp:95:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parb.in","r",stdin); ^ user.cpp:96:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:101:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&f,&g); ^