Compilare: main.cpp: In function 'void sol(long long int, long long int, bool, long long int)': main.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sf-inc+1==start.size()){ ~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<start.size();i++){ ~^~~~~~~~~~~~~