Compilare: main.cpp: In function 'void inter(int, int, int)': main.cpp:119:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[a].size() && j < tree[b].size()) ~~^~~~~~~~~~~~~~~~ main.cpp:119:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < tree[a].size() && j < tree[b].size()) ~~^~~~~~~~~~~~~~~~ main.cpp:133:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i != tree[a].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:137:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j != tree[b].size()) ~~^~~~~~~~~~~~~~~~~