Compilare: main.cpp: In function 'int main()': main.cpp:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (i = 1; i <= a.size(); i++) | ~~^~~~~~~~~~~ main.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for (i = 1; i <= a.size(); i++) | ~~^~~~~~~~~~~