Compilare: main.cpp: In function 'int main()': main.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int i = 0 ; i < a.size() ; i ++ ) | ~~^~~~~~~~~~ main.cpp:40:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for ( int j = 0 ; j < a.size() ; j ++ ) | ~~^~~~~~~~~~ main.cpp:53:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for ( int j = 0; j < a.size() ; j ++ ) | ~~^~~~~~~~~~