Compilare: user.cpp: In function ‘void dfs_sol(int)’: user.cpp:64:14: warning: unused variable ‘ast’ [-Wunused-variable] bool ast=0; ^ user.cpp:65:13: warning: unused variable ‘minval’ [-Wunused-variable] int minval=0; ^ user.cpp: In function ‘int main()’: user.cpp:78:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("biperm.in","r",stdin); ^ user.cpp:79:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("biperm.out","w",stdout); ^ user.cpp:80:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:81:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d",&v[1][i]); ^ user.cpp:84:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[2][i]); ^