Submission #136080

#	Time	Username	Problem	Language	Result	Execution time	Memory
136080		arthurconmy	Gondola (IOI14_gondola)	C++14	100 / 100	108 ms	6648 KiB

gondola

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

map<int,int> used;
const ll p = 1000000009;

ll modpow(ll a, ll b)
{
	if(b==0LL) return 1LL;

	ll cur = modpow(a,ll(b/2LL));
	cur*=cur;
	cur%=p;

	if(b%2 == 1LL) cur*=a;
	cur%=p;

	return cur;
}

int valid(int n, int S[])
{
	pair<int,int> minn = {int(1e9),int(1e9)};

	for(int i=0; i<n; i++)
	{
		if(used[S[i]]==1) return 0;
		used[S[i]]=1;

		minn = min(minn, make_pair(S[i],i));
	}

	int cur = minn.first;
	if(cur>n) return 1;

	int one_pos = (minn.second - minn.first + 1 + n)%n;

	for(int j=0; j<n; j++)
	{
		if(S[(one_pos+j)%n] == j+1 || S[(one_pos+j)%n]>n) continue;
		return 0;
	}

	return 1;
}

int replacement(int n, int G[], int R[])
{
	pair<int,int> minn = {int(1e9),int(1e9)};

	for(int i=0; i<n; i++)
	{
		minn = min(minn, make_pair(G[i],i));
	}

	int cur = minn.first;

	int one_pos = (minn.second - minn.first + 1 + n)%n;

	if(cur>n) one_pos=0;

	vector<pair<int,int>> reps;

	for(int j=0; j<n; j++)
	{
		if(G[(one_pos+j)%n] == j+1) continue;
		reps.push_back(make_pair(G[(one_pos+j)%n],j+1));
	}

	sort(reps.begin(),reps.end());

	int ans=0;
	int next_boat=n+1;

	for(auto rep:reps)
	{
		int cur = rep.second;

		for(int i=next_boat; i<=rep.first; i++)
		{
			// cout << cur << endl;
			R[ans] = cur;
			cur=next_boat;

			ans++;
			next_boat++;
		}
	}

	// cout << endl;

	return ans;
}

int countReplacement(int n, int S[])
{
	pair<int,int> minn = {int(1e9),int(1e9)};

	for(int i=0; i<n; i++)
	{
		if(used[S[i]]==1) return 0;
		used[S[i]]=1;

		minn = min(minn, make_pair(S[i],i));
	}

	int cur = minn.first;
	int one_pos=-1;
	bool orientation_lost=0;

	if(cur>n)
	{
		one_pos=0;
		orientation_lost=1;
	}

	else
	{
		one_pos = (minn.second - minn.first + 1 + n)%n;
		orientation_lost=0;
	}

	if(cur>n)
	{
		one_pos=0;
		orientation_lost=1;
	}

	for(int j=0; j<n; j++)
	{
		if(S[(one_pos+j)%n] == j+1 || S[(one_pos+j)%n]>n) continue;
		return 0;
	}

	vector<int> V={0};

	for(int j=0; j<n; j++)
	{
		if(S[(one_pos+j)%n] == j+1) continue;
		V.push_back(S[(one_pos+j)%n]-n);
	}

	if(V.size()==1) return 1;

	sort(V.begin(),V.end());
	// for(auto v:V) cout << v << endl;

	ll ans=1;

	for(int i=1; i<int(V.size()); i++)
	{
		ans*=modpow(ll(V.size())-ll(i),ll(V[i]-V[i-1]-1));
		ans%=p;
	}

	if(orientation_lost)
	{
		ans*=n;
		ans%=p;
	}

	return int(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