Submission #953695

#	Time	Username	Problem	Language	Result	Execution time	Memory
953695		emad234	Gondola (IOI14_gondola)	C++17	55 / 100	33 ms	6964 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pii pair<ll, ll>
const ll mod = 1e9 + 9;
const ll mxN = 3e5 + 5;
using namespace std;
int realS[mxN];
bool allB;
bool cnt;
int aval;
int mx = 0;
int valid(int n, int inputSeq[])
{
  allB = 1;
  memset(realS, 0, sizeof(realS));
  map<int,bool>vis;
  int st = 0;
  int val = 1;
  for (int i = 0; i < n; i++)
  {
    mx = max(mx, inputSeq[i]);

    if (vis[inputSeq[i]])
      return 0;
    vis[inputSeq[i]] = 1;
    if (inputSeq[i] <= n)
    {
      allB = 0;
      aval--;
      st = i;
      val = inputSeq[i];
    }
  }
  int og = st;
  while (1)
  {
    st++;
    val++;
    if (st >= n)
      st = 0;
    if (val > n)
      val = 1;
    if(!cnt) realS[inputSeq[st]] = val;
    if (st == og)
      break;
    if (inputSeq[st] != val && inputSeq[st] <= n)
      return 0;
  }
  return 1;
}

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

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
  if(!valid(n, gondolaSeq)) return 0;
  int id = 0;
  for (int i = n + 1; i <= mx; i++)
  {
    if (!realS[i])
    {
      replacementSeq[id] = realS[mx];
      realS[mx] = i;
    }
    else
      replacementSeq[id] = realS[i];
    id++;
  }
  return id;
}

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

int countReplacement(int n, int inputSeq[])
{
  cnt = 1;
  aval = n;
  ll ans = 1;
  if(!valid(n, inputSeq))return 0;
  int id = 0;
  for (int i = n + 1; i <= mx; i++)
  {
    if (!realS[i])
      ans *= aval;
    else
      aval--;
    ans %= mod;
  }
  if (allB)
    ans *= n;
  ans %= mod;
  return ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:83:7: warning: unused variable 'id' [-Wunused-variable]
   83 |   int id = 0;
      |       ^~

• 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: 0 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10