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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3. #include <ext/pb_ds/tree_policy.hpp>
  4.  
  5. using namespace __gnu_pbds;
  6. using namespace std;
  7.  
  8. #define PG_Mazen ios_base::sync_with_stdio( 0 ), cin.tie( 0 ), cout.tie( 0 );
  9. #define el '\n'
  10. #define sp ' '
  11. #define all(v) v.begin(), v.end()
  12. #define r_all(v) (v).rbegin(), (v).rend()
  13. #define SZ(v) (v).size()
  14. #define pb(n) push_back(n)
  15. #define eb(n, m) emplace_back(n, m)
  16. #define YES cout << "YES\n"
  17. #define NO cout << "NO\n"
  18. #define ll long long
  19. #define ull unsigned long long
  20. #define ld long double
  21. #define pii pair<int, int>
  22. #define pll pair<ll,ll>
  23. #define F first
  24. #define S second
  25. #define loop int t; cin >> t; for(int i=1;i<=t;++i)
  26. #define f0(i, st, n) for(int i=st;i<n;++i)
  27. #define f1(i, st, n) for(int i=st;i<=n;++i)
  28. #define fe(it, n) for(auto &it : n)
  29. #define mms(arr, val) memset(arr, val, sizeof arr)
  30. #define mmv(vec, val) memset(vec[0], val, sizeof(vec) * SZ(vec))
  31. #define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
  32.  
  33. const int N = 2e5 + 5, MOD = 998244353, oo = 0x3f3f3f3f;
  34. const ll ooo = 0x3f3f3f3f3f3f3f3f;
  35.  
  36. ull solve(ull a, ull b) {
  37.     // a <= b * 2^x
  38.     ull ans = 0;
  39.     for (ull i = 1; i <= 63; ++i) {
  40.         if (a <= b * (1ull << i)) {
  41.             ans = i;
  42.             break;
  43.         }
  44.     }
  45.     return ans;
  46. }
  47.  
  48. void testCase() {
  49.     ll n;
  50.     cin >> n;
  51.     vector<ull> v(n);
  52.     for (int i = 0; i < n; ++i) cin >> v[i];
  53.     ull ans = 0;
  54.     for (ull i = 1; i < n; ++i) {
  55.         if (v[i - 1] <= v[i])
  56.             continue;
  57.         ull res = solve(v[i - 1], v[i]);
  58.         v[i] = v[i] * (1ull << res);
  59.         ans += res;
  60.     }
  61.     cout << ans << '\n';
  62. }
  63.  
  64. int main() {
  65.     PG_Mazen
  66.     //freopen("input.txt", "r", stdin);
  67.     //freopen("output.txt", "w", stdout);
  68.     loop testCase();
  69. }
Success #stdin #stdout 0.01s 5504KB
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language:
C++14 (gcc 8.3)
created:
200 days ago
visibility:
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