Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:81:32: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for (int step = 1; (1<<step-1) <= N; step++) ^ user.cpp:87:42: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] L[i].nr[1] = (lvl[i]-(1<<step-1)) > 1 ? P[step-1][T[step-1][i]] : -1; ^