Submission #1278849

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278849		stanwaibbange	Gondola (IOI14_gondola)	C++20	100 / 100	28 ms	6100 KiB

gondola

#include <bits/stdc++.h>
using namespace std;

#include "gondola.h"
using ll = long long;
const int INF = numeric_limits<int>::max() / 2;

int valid(int n, int inputSeq[])
{
  int minv = INF;
  int index = -1;
  for (int i = 0; i < n; ++i)
  {
    if (inputSeq[i] <= 0)
    {
      return 0;
    }
    if (inputSeq[i] <= n)
    {
      minv = inputSeq[i] - i;
      index = i;
      break;
    }
  }
  for (int i = index + 1; i < n; ++i)
  {
    if (inputSeq[i] <= 0)
    {
      return 0;
    }
    if (inputSeq[i] <= n)
    {
      if (inputSeq[i]%n != (minv + i)%n)
      {
        return 0;
      }
    }
  }
  sort(inputSeq,inputSeq+n);
  int last = -1;
  for (int i = 0; i < n; ++i)
  {
    if (inputSeq[i] == last) {
      return 0;
    }
    last = inputSeq[i];
  }
  return 1;
}

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

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
  int minv = 1;
  int index = -1;
  int l = 0;
  map<int,int> m{};
  for (int i = 0; i < n; ++i)
  {
    m[gondolaSeq[i]] = i;
    // if (gondolaSeq[i] <= n)
    // {
    //   minv = gondolaSeq[i] - i;
    //   index = i;
    //   break;
    // }
  }
  for (auto p : m) {
    if (p.first <= n) {
      minv = (p.first - p.second + n)%n;
    }
    break;
  }
  int rep = n+1;
  for (auto p : m) {
    if (p.first <= n) {
      continue;
    }
    int r = (minv + p.second + n)%n;
    if (r==0) {
      r = n;
    }
    while (r < p.first) {
      replacementSeq[l] = r;
      ++l;
      r = rep;
      ++rep;
    }
  }
  return l;
}

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

int M = 1000000009;

ll exp(ll a, ll b) {
  if (b==0) {
    return 1;
  }
  if (b==1) {
    return a;
  }
  ll half = exp(a,b/2);
  if (b%2==0){
    return (half*half)%M;
  }
  else {
    return (((half*half)%M)*a)%M;
  }
}

int countReplacement(int n, int inputSeq[])
{
  if (!(valid(n,inputSeq))) {
    return 0;
  }
  int minv = 1;
  int index = -1;
  int l = 0;
  map<int,int> m{};
  for (int i = 0; i < n; ++i)
  {
    m[inputSeq[i]] = i;
    // if (gondolaSeq[i] <= n)
    // {
    //   minv = gondolaSeq[i] - i;
    //   index = i;
    //   break;
    // }
  }
  ll out = 1;
  for (auto p : m) {
    if (p.first <= n) {
      minv = (p.first - p.second + n)%n;
      break;
    }
    out=n;
    break;
  }
  ll last = n;
  ll broken = n;
  for (auto p : m) {
    if (p.first <= n) {
      --broken;
      continue;
    }
    out = (out * exp(broken,(p.first-last-1)))%M;
    last = p.first;
    --broken;
  }
  return out;
}

• 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