Compilare: main.cpp: In function 'int main()': main.cpp:7:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pesti.in","r",stdin); ^ main.cpp:8:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pesti.out","w",stdout); ^ main.cpp:34:20: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<p<<" "<<u; ^ main.cpp:30:9: warning: 'pant' may be used uninitialized in this function [-Wmaybe-uninitialized] if(pant!=p) ^~