Submission #891549

#	Time	Username	Problem	Language	Result	Execution time	Memory
891549		AkibAzmain	Gondola (IOI14_gondola)	C++17	100 / 100	16 ms	3024 KiB

gondola

#include <bits/stdc++.h>
#include "gondola.h"
using namespace std;
using ll = long long;

int valid(int n, int a[])
{
  bool y = true;
  for (int i = 1; y && i < n; ++i) y = (a[i] - a[i - 1] + n) % n == 1;
  return y;
}

//----------------------

int replacement(int n, int a[], int ans[])
{
  int org = -1;
  for (int i = 0; i < n; ++i)
    if (a[i] <= n)
      {
        int norg = (i - a[i] + 1 + n) % n;
        assert (org == -1 || org == norg);
        org = norg;
      }
  if (org == -1) org = 0;
  vector < pair < int, int > > v;
  for (int i = 0; i < n; ++i) if (a[i] > n) v.push_back ({ a[i], (i - org + n) % n + 1 });
  sort (v.begin (), v.end ());
  int i = 0;
  for (auto &x : v)
    {
      while (x.first != x.second)
        {
          ans[i] = x.second;
          x.second = i + n + 1;
          ++i;
        }
    }
  return i;
}

//----------------------

ll MOD = 1000000009;

ll
binpow (ll a, ll b)
{
  ll ans = 1;
  while (b)
    {
      if (b % 2) (ans *= a) %= MOD;
      b /= 2;
      if (b) (a *= a) %= MOD;
    }
  return ans;
}

int countReplacement(int n, int a[])
{
  int org = -1;
  for (int i = 0; i < n; ++i)
    if (a[i] <= n)
      {
        int norg = (i - a[i] + 1 + n) % n;
        if (org != -1 && org != norg) return 0;
        org = norg;
      }
  bool ind = false;
  if (org == -1) org = 0, ind = true;
  vector < ll > v;
  for (int i = 0; i < n; ++i) if (a[i] > n) v.push_back (a[i]);
  sort (v.begin (), v.end ());
  ll vs = v.size (), ans = 1, p = n;
  for (auto &x : v)
    (ans *= binpow (vs--, x - p - 1)) %= MOD, p = x;
  if (ind) (ans *= (ll) n) %= MOD;
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 20 / 20
• Subtask 7: 5 / 5
• Subtask 8: 15 / 15
• Subtask 9: 15 / 15
• Subtask 10: 10 / 10