Compilare: main.cpp: In function 'int main()': main.cpp:19:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int i = 1 ; i < a.size() ; i++) | ~~^~~~~~~~~~ main.cpp:22:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int j = i ; j < a.size() ; j++) | ~~^~~~~~~~~~