func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   const ll base = 1000000007;   int n;   ll p2[1000000];   class reimu {    public:     ll sum, sum2;     int sz;     ll ans = 0;     void operator+=(reimu x) {       (sum2 += x.sum2) %= base;       (sum += x.sum) %= base;       sz += x.sz;     }     void operator-=(reimu x) {       (sum2 -= x.sum2) %= base;       (sum -= x.sum) %= base;       sz -= x.sz;     }     void cal() {       (ans = sum2 * p2[sz - 1] +              ((sz == 1) ? 0 : ((sum * sum - sum2) % base) * p2[sz - 2])) %= base;     }   } f[1000000];   ll pre[64];   int main() {     p2[0] = 1;     for (int i = 1; i < 1000000; i++) (p2[i] = p2[i - 1] * 2) %= base;     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     cin >> n;     for (int i = 0; i < 64; i++) {       for (int d = 0, p10 = 1; d < 6; d++, p10 *= 10)         if (i & (1 << d)) {           pre[i] += p10;         }     }     for (int i = 0; i < n; i++) {       ll a;       cin >> a;       reimu temp;       temp.sum = a;       (temp.sum2 = a * a) %= base;       temp.sz = 1;       f[a] += temp;     }     for (int x = 999999; x >= 0; x--) {       int mask = 0;       for (int d = 0, p10 = 1; d < 6; d++, p10 *= 10) {         if ((x / p10) % 10 != 9) mask |= 1 << d;       }       for (int sub = mask; sub; (sub -= 1) &= mask) {         if (__builtin_popcount(sub) % 2 == 1)           f[x] += f[x + pre[sub]];         else           f[x] -= f[x + pre[sub]];       }     }     for (int i = 0; i <= 999999; i++) f[i].cal();     ll ans = 0;     for (int x = 0; x <= 999999; x++) {       int mask = 0;       for (int d = 0, p10 = 1; d < 6; d++, p10 *= 10) {         if ((x / p10) % 10 != 9) mask |= 1 << d;       }       ll res = f[x].ans;       for (int sub = mask; sub; (sub -= 1) &= mask) {         if (__builtin_popcount(sub) % 2 == 0)           res += f[x + pre[sub]].ans;         else           res -= f[x + pre[sub]].ans;       }       ((res %= base) += base) %= base;       (res *= x);       ans ^= res;     }     cout << ans <<   n ;   }   