Compilare: main.cpp: In function 'void bkt2(int, long long int, std::vector<char>, long long int)': main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < f1[x - s].size(); i++) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int i = 0; i < f.size(); i++) | ~~^~~~~~~~~~