Compilare: main.cpp: In function 'int main()': main.cpp:30:8: warning: unused variable 'cnt' [-Wunused-variable] ll cnt=0, ans=0; ^~~ main.cpp:18:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("covrigi.in","r",stdin); ^ main.cpp:19:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("covrigi.out","w",stdout); ^