Submission #547231

#	Time	Username	Problem	Language	Result	Execution time	Memory
547231		Hanksburger	Gondola (IOI14_gondola)	C++17	90 / 100	19 ms	3424 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
using namespace std;
const long long mod=1000000009;
int sorted[100005], pos[250005], cnt[250005];
vector<int> vec;
int valid(int n, int a[])
{
	for (int i=0; i<n; i++)
		sorted[i]=a[i];
	sort(sorted, sorted+n);
	for (int i=1; i<n; i++)
		if (sorted[i-1]==sorted[i])
			return 0;
	for (int i=0; i<n; i++)
	{
		if (a[i]<=n)
		{
			for (int j=i+1; j<i+n; j++)
				if (a[j%n]<=n && a[j%n]!=(a[i]+j-i-1)%n+1)
					return 0;
			return 1;
		}
	}
	return 1;
}
int replacement(int n, int a[], int b[])
{
	int num=1, maxi=n;
	for (int i=0; i<n; i++)
	{
		if (a[i]<=n)
		{
			num=(n+a[i]-i-1)%n+1;
			break;
		}
	}
	for (int i=0; i<n; i++)
	{
		maxi=max(maxi, a[i]);
		pos[a[i]]=i+1;
	}
	for (int i=n+1; i<=maxi; i++)
	{
		int index=i;
		while (!pos[i])
			i++;
		vec.push_back((num+pos[i]-2)%n+1);
		for (int j=index; j<i; j++)
			vec.push_back(j);
	}
	for (int i=0; i<vec.size(); i++)
		b[i]=vec[i];
	return vec.size();
}
int countReplacement(int n, int a[])
{
	if (!valid(n, a))
		return 0;
	int num=0, maxi=n;
	long long ans=1;
	for (int i=0; i<n; i++)
	{
		if (a[i]<=n)
		{
			num=(n+a[i]-i-1)%n+1;
			break;
		}
	}
	if (!num)
	{
		ans=n;
		num=1;
	}
	for (int i=0; i<n; i++)
	{
		maxi=max(maxi, a[i]);
		pos[a[i]]=i+1;
	}
	for (int i=maxi; i>n; i--)
	{
		if (pos[i])
			cnt[i]=cnt[i+1]+1;
		else
		{
			cnt[i]=cnt[i+1];
			ans=(ans*cnt[i])%mod;
		}
	}
	return ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:52:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |  for (int i=0; i<vec.size(); i++)
      |                ~^~~~~~~~~~~

• 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: 0 / 10