Submission #1081082

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081082		juicy	Holiday (IOI14_holiday)	C++17	23 / 100	135 ms	5976 KiB

holiday

#include "holiday.h"

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5;
const long long inf = 1e18;

int n, d, start;
int a[N], rk[N], cnt[4 * N];
long long s[4 * N];
bool on[N];

long long qry(int k, int id = 1, int l = 0, int r = n - 1) {
  if (l == r) {
    return s[id];
  }
  int m = (l + r) / 2;
  return k > cnt[id * 2] ? qry(k - cnt[id * 2], id * 2 + 1, m + 1, r) + s[id * 2] : qry(k, id * 2, l, m);
}

void pul(int id) {
  cnt[id] = cnt[id * 2] + cnt[id * 2 + 1];
  s[id] = s[id * 2] + s[id * 2 + 1];
}

void upd(int i, int x, int id = 1, int l = 0, int r = n - 1) {
  if (l == r) {
    s[id] = x;
    cnt[id] = bool(x);
    return;
  }
  int m = (l + r) / 2;
  if (i <= m) {
    upd(i, x, id * 2, l, m);
  } else {
    upd(i, x, id * 2 + 1, m + 1, r);
  }
  pul(id);
} 

void tog(int i) {
  on[i] ^= 1;
  upd(rk[i], on[i] ? a[i] : 0);
}

int L = 0, R = -1;

void shift(int l, int r) {
  while (R < r) {
    tog(++R);
  }
  while (L > l) {
    tog(--L);
  }
  while (R > r) {
    tog(R--);
  }
  while (L < l) {
    tog(L++);
  }
}

long long res = -inf;

void dc(int l, int r, int u, int v) {
  if (l > r) {
    return;
  }
  int m = (l + r) / 2;
  pair<long long, int> best = {-inf, -1};
  for (int i = max(u, m); i <= v; ++i) {
    shift(m, i);
    int dis = min(start - m + i - m, i - start + i - m);
    if (dis <= d) {
      int cnt = min(d - dis, i - m + 1);
      long long x = !cnt ? 0 : qry(cnt);
      best = max(best, {x, i});
    }
  }
  res = max(res, best.first);
  dc(l, m - 1, u, best.second);
  dc(m + 1, r, best.second, v);
}

long long findMaxAttraction(int n, int s, int d, int *a) {
  vector<int> ord(n); iota(ord.begin(), ord.end(), 0);
  sort(ord.begin(), ord.end(), [&](int i, int j) {
    return a[i] > a[j];
  });
  ::n = n, ::start = s, ::d = d;
  for (int i = 0; i < n; ++i) {
    rk[ord[i]] = i;
    ::a[i] = a[i];
  }
  dc(0, start, start, n - 1);
  return res;
}

• Subtask 1: 0 / 7
• Subtask 2: 23 / 23
• Subtask 3: 0 / 17
• Subtask 4: 0 / 53