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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int N = 1e5 + 9, mod = 998244353;
  5. vector<int> v[2];
  6. int dp[2][N];
  7. int a[N];
  8. int32_t main() {
  9.   ios_base::sync_with_stdio(0);
  10.   cin.tie(0);
  11.   int t; cin >> t;
  12.   while (t--) {
  13.     int n; cin >> n;
  14.     for (int i = 1; i <= n; i++) {
  15.       cin >> a[i];
  16.     }
  17.     long long ans = 0;
  18.     for (int i = n; i >= 1; i--) {
  19.       int k = i & 1;
  20.       v[k].push_back(a[i]);
  21.       dp[k][a[i]] = 1;
  22.       int last = a[i];
  23.       for (auto x: v[k ^ 1]) {
  24.         int y = dp[k ^ 1][x];
  25.         int split = (a[i] + x - 1) / x;
  26.         int st = a[i] / split;
  27.         ans += 1LL * (split - 1) * y * i;
  28.         dp[k][st] += y;
  29.         if (last != st) {
  30.           v[k].push_back(st), last = st;
  31.         }
  32.       }
  33.       for (auto x: v[k ^ 1]) dp[k ^ 1][x] = 0;
  34.       v[k ^ 1].clear();
  35.       ans %= mod;
  36.     }
  37.     cout << ans << '\n';
  38.     for (auto x: v[0]) dp[0][x] = 0;
  39.     for (auto x: v[1]) dp[1][x] = 0;
  40.     v[0].clear(); v[1].clear();
  41.   }
  42.   return 0;
  43. }
Success #stdin #stdout 0s 5304KB
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https://ideone.com/uqW0Pm
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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