Compilare: main.cpp: In function 'void dfs(const std::string&, bool, int, int)': main.cpp:10:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | if (ptr == str.size() - 1) { | ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int count(const std::string&, int, int)': main.cpp:41:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if (ptr == str.size() - 1) return graph[row][str[ptr - 1] - 'a'][str[ptr] - 'a'].words; | ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int find_max(const std::string&, int, int)': main.cpp:46:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 46 | if (str.size() - 1 == ptr) return 0; | ~~~~~~~~~~~~~~~^~~~~~