Compilare: main.cpp: In function 'int f1(int&)': main.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (int i = 0; i < v.size(); i++) | ~~^~~~~~~~~~ main.cpp:91:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 91 | for (int j = i + 1; j < v.size(); j++) | ~~^~~~~~~~~~