Compilare: main.cpp: In function 'void solve1()': main.cpp:18:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for (int i=1; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:59:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for (int i=2; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for (int i=0; i<v.size(); i++) | ~^~~~~~~~~