Compilare: main.cpp: In function 'void rec(long long int, long long int)': main.cpp:11:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int j = 1; j < s.size(); j++){ | ~~^~~~~~~~~~ main.cpp:13:51: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | while(s[j] != '+' && s[j] != ':' && j < s.size()){ | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int j = 0; j < s.size(); j++){ | ~~^~~~~~~~~~ main.cpp:53:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int j = 1; j < s.size(); j++){ | ~~^~~~~~~~~~ main.cpp:55:59: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while(s[j] != '+' && s[j] != ':' && j < s.size()){ | ~~^~~~~~~~~~ main.cpp:73:20: warning: loop variable 'x' creates a copy from type 'const std::pair<const std::pair<long long int, long long int>, std::__cxx11::basic_string<char> >' [-Wrange-loop-construct] 73 | for(const auto x : mp){ | ^ main.cpp:73:20: note: use reference type to prevent copying 73 | for(const auto x : mp){ | ^ | &