Compilare: main.cpp: In lambda function: main.cpp:32:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i=size;i<s.size();i++) | ~^~~~~~~~~ main.cpp:34:44: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 34 | if(s[i-size]=='a')nr-=1ll<<size-1; | ~~~~^~