Compilare: user.cpp: In function ‘int main()’: user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamster.in","r",stdin); ^ user.cpp:31:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamster.out","w",stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:14:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir,1,Xp,stdin),pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:88:38: warning: ‘sol2’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(x) v[++v[0]]=x%10,x/=10; ^