Compilare: main.cpp: In function 'std::vector<int> lis(std::vector<int>)': main.cpp:14:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i=0; i<x.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:55:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while(i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:55:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | while(i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:82:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | while(i < a.size()) | ~~^~~~~~~~~~ main.cpp:88:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | while(j < b.size()) | ~~^~~~~~~~~~