Compilare: main.cpp: In function 'int main()': main.cpp:223:49: warning: 'p1.std::pair<int, int>::second' may be used uninitialized in this function [-Wmaybe-uninitialized] if(i%2) cout<<p1.first<<' '<<p1.second<<'\n'; ^~~~ main.cpp:223:33: warning: 'p1.std::pair<int, int>::first' may be used uninitialized in this function [-Wmaybe-uninitialized] if(i%2) cout<<p1.first<<' '<<p1.second<<'\n'; ^~~ main.cpp:217:41: warning: 'p3.std::pair<int, int>::second' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<p3.first<<' '<<p3.second<<'\n'; ^~~~ main.cpp:217:25: warning: 'p3.std::pair<int, int>::first' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<p3.first<<' '<<p3.second<<'\n'; ^~~