Compilare: main.cpp: In function 'void update(int, int)': main.cpp:38:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos <= sol.size()) { ~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= lca.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j + (1<<i) - 1 <= lca.size(); ++j) { ~~~~~~~~~~~~~~~^~~~~~~~~~~~~