Compilare: main.cpp: In function 'int main()': main.cpp:23:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for( i = 1; i < s.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:30:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if( k == a.size() ) { | ~~^~~~~~~~~~~ main.cpp:38:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for( i = 0; i < v.size(); i++ ) | ~~^~~~~~~~~~