Compilare: main.cpp: In function 'void dfs(const std::string&, bool, int, int)': main.cpp:12:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | if (ptr == str.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'int count(const std::string&, int, int)': main.cpp:32:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if (ptr == str.size()) 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:37:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if (ptr == str.size()) return row; | ~~~~^~~~~~~~~~~~~