Compilare: main.cpp: In function 'std::pair<char, bool> find_character(const std::string&, long long unsigned int)': main.cpp:46:16: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 46 | while (len < n) { | ~~~~^~~ main.cpp: In function 'long long unsigned int count_character(const std::string&, long long unsigned int, char, bool)': main.cpp:65:16: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 65 | while (len < n) { | ~~~~^~~ main.cpp:74:23: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 74 | for (int i = 0; i < n; ++i) { | ~~^~~