func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e5 + 5;   const int M = 22;   int n, a[N];   long long f[N][M][2];   vector<int> v[N];   long long ans = 0;   void dfs(int x, int tr) {     ans += a[x];     for (int i = 0; i < M; i++) {       f[x][i][(a[x] >> i) & 1]++;     }     for (auto u : v[x])       if (u != tr) {         dfs(u, x);         for (int i = 0; i < M; i++) {           ans += (1 << i) * (f[x][i][0] * f[u][i][1] + f[x][i][1] * f[u][i][0]);           f[x][i][((a[x] >> i) & 1) ^ 0] += f[u][i][0];           f[x][i][((a[x] >> i) & 1) ^ 1] += f[u][i][1];         }       }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cin >> n;     for (int i = 1; i <= n; i++) {       cin >> a[i];     }     for (int i = 1; i < n; i++) {       int x, y;       cin >> x >> y;       v[x].push_back(y);       v[y].push_back(x);     }     dfs(1, 0);     cout << ans;     return 0;   }   