Compilare: user.cpp: In function ‘int main()’: user.cpp:77:11: warning: unused variable ‘u’ [-Wunused-variable] for (int u, v, c, i = 2; i <= n; ++i) { ^ user.cpp:113:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int a, b, god, cost, edge = 0, cq = 0; cq < queries.size(); ++cq) { ~~~^~~~~~~~~~~~~~~~ user.cpp:114:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (edge < edges.size() && edges[edge].c < queries[cq].c) { ~~~~~^~~~~~~~~~~~~~