func_code_string: #include <bits/stdc++.h>   namespace chtholly {   char buf[1 << 23], *p1 = buf, *p2 = buf;   inline int read() {     int x = 0, f = 1;     char c = getchar();     for (; !isdigit(c); c = getchar()) f ^= c ==  - ;     for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^  0 );     return f ? x : -x;   }   template <typename mitsuha>   inline bool read(mitsuha &x) {     x = 0;     int f = 1;     char c = getchar();     for (; !isdigit(c) && ~c; c = getchar()) f ^= c ==  - ;     if (!~c) return 0;     for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^  0 );     return x = f ? x : -x, 1;   }   template <typename mitsuha>   inline int write(mitsuha x) {     if (!x) return 0 & putchar(48);     if (x < 0) putchar( - ), x = -x;     int bit[20], i, p = 0;     for (; x; x /= 10) bit[++p] = x % 10;     for (i = p; i; --i) putchar(bit[i] + 48);     return 0;   }   inline char fuhao() {     char c = getchar();     for (; isspace(c); c = getchar())       ;     return c;   }   }  // namespace chtholly   using namespace chtholly;   using namespace std;   const int yuzu = 2e5;   typedef int fuko[yuzu | 10];   vector<int> lj[yuzu | 10];   fuko a;   int zxy;   int dfs(int u, int lxy, int fa = 0) {     if (a[u] % lxy) return 0;     for (; a[u] % lxy == 0; a[u] /= lxy)       ;     vector<int> v;     for (int i : lj[u])       if (i ^ fa) v.push_back(dfs(i, lxy, u));     sort(v.begin(), v.end(), greater<int>());     int llx = 1;     if (v.size()) llx += v[0];     if (v.size() > 1) zxy = max(zxy, llx + v[1]);     return zxy = max(zxy, llx), llx;   }   int main() {     int i, j, n = read(), u, v;     for (i = 1; i <= n; ++i) a[i] = read();     for (i = 1; i < n; ++i) {       read(u), read(v);       lj[u].push_back(v);       lj[v].push_back(u);     }     for (i = 1; i <= n; ++i) {       for (j = 2; j * j <= a[i]; ++j)         if (a[i] % j == 0) dfs(i, j);       if (a[i] > 1) dfs(i, a[i]);     }     write(zxy), puts(  );   }   