Compilare: main.cpp: In function 'int main()': main.cpp:66:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pii>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int i = 0; i < st1.size() - 1; i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:71:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pii>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (int i = 0; i < st2.size() - 1; i++) | ~~^~~~~~~~~~~~~~~~