Submission #128124

#	Time	Username	Problem	Language	Result	Execution time	Memory
128124		RockyB	Worst Reporter 3 (JOI18_worst_reporter3)	C++17	100 / 100	847 ms	30788 KiB

worst_reporter3

#include <bits/stdc++.h>
 
#define int ll
 
#define f first
#define s second
 
#define pb push_back
#define pp pop_back
 
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
 
#define rep(a, b, c) for (int a = (b); (a) <= (c); ++a)
#define per(a, b, c) for (int a = (b); (a) >= (c); --a) 
 
#define nl '\n'
#define ioi exit(0);
 
using namespace std;
 
typedef long long ll;
 
const int MAX_N = (int)5e5 + 7;
 
int n, q;
int d[MAX_N], l[MAX_N], r[MAX_N], t[MAX_N], ans[MAX_N];
 
map <int, vector <int> > off;
 
int nxt[MAX_N], lst[MAX_N];
void prep() {
  int last = 1;
  rep(i, 1, n) {
    int df = (d[i] + last - 1) / last;
    lst[i] = df * last;
    last *= df;
  }
  per(i, n, 1) {
    if (lst[i] != lst[i + 1] || i == n) nxt[i] = i + 1;
    else nxt[i] = nxt[i + 1];
  }
}

pair < pair <int, int>, ll> a[MAX_N];
void solve(int T, const vector <int> &qr) {
  int add = T;
  int sz = 0;
  int last = 1;
  for (int i = 1, j = 0; i <= n; j = i + 1, i = nxt[i]) {
    int df = (d[i] + last - 1) / last;
 
    if (!sz) a[sz++] = {{0, i - 1}, i - 1};
    else a[sz++] = {{j, i - 1}, {i - j}};
    a[sz++] = {{i, i}, 1 + last * (add % df)};
    last *= df;
    add /= df;
    if (!add || nxt[i] > n) {
      if (i < n) a[sz++] = {{i + 1, n}, {n - i}};
      break;
    }
  }
  for (auto it : qr) {
    int L = -1, R = -2;
    if (T >= l[it]) { // it's for right
      int ost = T - l[it];
      if (sz) {
        R = min(ost, a[0].s);
      }
    }
    int sum = 0;
    rep(i, 0, sz - 1) {
      sum += a[i].s;
      int val = T - sum;
      if (val >= l[it]) {
        R = a[i].f.s;
        
        int ost = val - l[it];
        if (i & 1 && i + 1 < sz) {
          R += min(ost, a[i + 1].s);
        }
      }
      if (val <= r[it] && L == -1) {
        L = a[i].f.s;
        if (i % 2 == 0) {
          L -= max(0ll, min(r[it] - val, a[i].s - 1));
        }
      }
    }
    if (L != -1 && L <= R) ans[it] += R - L + 1;
  } 
}
int32_t main() {
  #ifdef IOI
    freopen ("in.txt", "r", stdin);
    freopen ("C.out", "w", stdout);
  #endif
  ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n >> q;
  d[0] = 1;
  rep(i, 1, n) {
    cin >> d[i];
  }
  prep();
  rep(i, 1, q) {
    cin >> t[i] >> l[i] >> r[i];
    solve(t[i], {i});
  }
  rep(i, 1, q) {
    cout << ans[i] << nl;
  }
 
  ioi
}

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 81 / 81