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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define FASTIO ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  4. typedef long long ll;
  5. using pii = pair<int, int>;
  6. const int N = 1000006;
  7.  
  8.  
  9. int dp[N], cxor[N];
  10.  
  11. void pre_calc(int n) {
  12.     for (int i = 1; i <= n; i++) {
  13.         for (int j = i; j <= n; j += i) {
  14.             dp[j]++;
  15.         }
  16.     }
  17.  
  18.     for (int i = 1; i <= n; i++) {
  19.         cxor[i] = cxor[i - 1] ^ dp[i];
  20.     }
  21. }
  22.  
  23. int main()
  24. {
  25.  
  26.  
  27.     FASTIO
  28.  
  29.     int n = 1000000;
  30.     pre_calc(n);
  31.     int q;
  32.     cin >> q;
  33.     assert(q <= 100000);
  34.     while (q--) {
  35.         int l, r;
  36.         cin >> l >> r;
  37.         assert(l <= r);
  38.         assert(l > 0 && r <= n);
  39.         if ((cxor[r] ^ cxor[l - 1]) > 0)
  40.             cout << "Alice\n";
  41.         else cout << "Bob\n";
  42.     }
  43. }
Success #stdin #stdout 0.03s 11300KB
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https://ideone.com/EwkMjX
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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