func_code_string: #include <bits/stdc++.h>   using namespace std;   map<int, long long> ans, re, now;   int n, h[200005], tot, mp[200005], siz[200005], mz[200005], rem[200005], cnt;   bool vis[200005];   struct DX {     int v, p;   } dx[400005];   int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }   void add(int u, int v) {     dx[tot].p = h[u];     dx[tot].v = v;     h[u] = tot++;   }   void dfs_G(int u, int fx) {     siz[u] = 1;     rem[++cnt] = u;     mz[u] = 0;     for (int i = h[u]; ~i; i = dx[i].p) {       int v = dx[i].v;       if (v == fx || vis[v]) continue;       dfs_G(v, u);       siz[u] += siz[v];       mz[u] = max(mz[u], siz[v]);     }   }   int fd_G(int u) {     cnt = 0;     dfs_G(u, u);     for (int i = 1; i <= cnt; i++)       if (mz[rem[i]] <= siz[u] / 2 && siz[u] - siz[rem[i]] <= siz[u] / 2)         return rem[i];   }   void dfs(int u, int fx, int gc) {     re[gc = gcd(gc, mp[u])]++;     for (int i = h[u]; ~i; i = dx[i].p) {       int v = dx[i].v;       if (v == fx || vis[v]) continue;       dfs(v, u, gc);     }   }   void sol(int u) {     u = fd_G(u);     vis[u] = 1;     now[mp[u]] = 1;     ans[mp[u]] += 1;     for (int i = h[u]; ~i; i = dx[i].p) {       int v = dx[i].v;       if (vis[v]) continue;       dfs(v, 0, mp[u]);       for (map<int, long long>::iterator it = now.begin(); it != now.end(); it++)         for (map<int, long long>::iterator ti = re.begin(); ti != re.end(); ti++)           ans[gcd(it->first, ti->first)] += it->second * ti->second;       for (map<int, long long>::iterator ti = re.begin(); ti != re.end(); ti++)         now[ti->first] += ti->second;       re.clear();     }     now.clear();     for (int i = h[u]; ~i; i = dx[i].p) {       int v = dx[i].v;       if (vis[v]) continue;       sol(v);     }   }   int main() {     memset(h, -1, sizeof(h));     scanf( %d , &n);     for (int i = 1; i <= n; i++) scanf( %d , &mp[i]);     int a, b;     for (int i = 1; i < n; i++) {       scanf( %d%d , &a, &b);       add(a, b);       add(b, a);     }     sol(1);     for (map<int, long long>::iterator it = ans.begin(); it != ans.end(); it++)       printf( %d %lld n , it->first, it->second);     return 0;   }   