Compilare: main.cpp: In function 'std::unordered_map<char, int> getFreq(std::string)': main.cpp:12:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i = 0; i < str.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp: In function 'std::vector<mapping> runLengthEncoding(std::string)': main.cpp:28:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 1; i < str.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp: In function 'int solve(std::string, std::string)': main.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int p = 0; p < tokens1.size(); ++p) { | ~~^~~~~~~~~~~~~~~~ main.cpp:77:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<mapping>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for(int i = 0; i < firstMap.size(); ++i) { | ~~^~~~~~~~~~~~~~~~~ main.cpp:48:9: warning: variable 'i' set but not used [-Wunused-but-set-variable] 48 | int i, j; | ^ main.cpp: In function 'int main()': main.cpp:120:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | for(int i = 1; i < strings.size() - 1; i += 2) { | ~~^~~~~~~~~~~~~~~~~~~~