Compilare: main.cpp: In function 'void dfs(int)': main.cpp:40:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(i = 0; i < v[u].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:36:17: warning: unused variable 'j' [-Wunused-variable] 36 | int nod, i, j; | ^ main.cpp: In function 'void solve()': main.cpp:55:15: warning: iteration 3504 invokes undefined behavior [-Waggressive-loop-optimizations] 55 | p2[i] = p2[i-1] * 2 % MOD; | ~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:54:18: note: within this loop 54 | for(i = 1; i <= NMAX; i++) | ~~^~~~~~~