Compilare: main.cpp: In function 'void inter(int, int, int)': main.cpp:60:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[a].size() && j < tree[b].size()) ~~^~~~~~~~~~~~~~~~ main.cpp:60:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[a].size() && j < tree[b].size()) ~~^~~~~~~~~~~~~~~~ main.cpp:67:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i != tree[a].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:69:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j != tree[b].size()) ~~^~~~~~~~~~~~~~~~~