Submission #138744

#	Time	Username	Problem	Language	Result	Execution time	Memory
138744		Mahmoud_Adel	Gondola (IOI14_gondola)	C++14	30 / 100	15 ms	4220 KiB

gondola

#include "gondola.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e6+5, mod = 1e9+7;
int mark[N], mep[N];
int valid(int n, int inputSeq[])
{
	for(int i=0; i<n; i++)
	{
		if(mark[inputSeq[i]]) return 0;
		else mark[inputSeq[i]] = 1;
	}
	int j = -1;
	for(int i=0; i<n; i++) if(inputSeq[i] > 0 && inputSeq[i] <= n) j = i;
	if(j == -1) return 1;
	for(int i=0; i<n; i++)
	{
		int id = (i+j)%n, jd = (i+j+1)%n;
		if(inputSeq[jd] > n) inputSeq[jd] = inputSeq[id]%n + 1;
		if(inputSeq[jd] != inputSeq[id]%n + 1) return 0;
	}
	return 1;
}

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

int replacement(int n, int inputSeq[], int replacementSeq[])
{
	memset(mep, 0, sizeof mep);
	int j = -1, c = n;
	for(int i=0; i<n; i++) if(inputSeq[i] <= n) j  = i;
	if(j == -1)
	{
		for(int i=0; i<n; i++) replacementSeq[inputSeq[i]-n-1] = i+1;
		return n;
	}
	for(int i=0; i<n; i++)
	{
		int id = (i+j) % n, jd = (i+j+1) % n;
		if(inputSeq[jd] > n) c = max(c, inputSeq[jd]), mep[inputSeq[jd]] = inputSeq[id]%n + 1,  inputSeq[jd] = inputSeq[id]%n + 1;
	}
	int last = -1;
	for(int i=c; i>n; i--)
	{
		if(mep[i] && last == -1) last = i;
		if(!mep[i]) 
		replacementSeq[i-n-1] = replacementSeq[last-n-1], replacementSeq[last-n-1] = i;
		else replacementSeq[i-n-1] = mep[i];
	}
	return c-n;
}

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

int countReplacement(int n, int inputSeq[])
{
	int tmp[n];
	for(int i=0; i<n; i++) tmp[i] = inputSeq[i];
	if(!valid(n, inputSeq)) return 0;
	for(int i=0; i<n; i++) inputSeq[i] = tmp[i];
	memset(mep, 0, sizeof mep);
	ll j = -1, c = n;
	for(int i=0; i<n; i++) if(inputSeq[i] <= n) j  = i;
	if(j == -1)
	{
		for(int i=0; i<n; i++)
		{
			c = max(c, (ll)inputSeq[i]);
			mep[inputSeq[i]] = 1;
		}
		ll cnt = 1, cmt=0;
		for(ll i=c; i>n; i--)
		{
			if(!mep[i]) cnt *=  (cmt), cnt %= mod;
			else cmt++;
		}
			return (cnt*n)%mod;
	}
	for(int i=0; i<n; i++)
	{
		ll id = (i+j) % n, jd = (i+j+1) % n;
		if(inputSeq[jd] > n) c = max(c, (ll)inputSeq[jd]), 
		mep[inputSeq[jd]] = inputSeq[id]%n + 1,  inputSeq[jd] = inputSeq[id]%n + 1;
	}
	ll cnt = 1, cmt=0;
	for(ll i=c; i>n; i--)
	{
		if(!mep[i]) cnt = (cnt%mod * cmt%mod)%mod;
		else cmt++;
	}
	return cnt;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 20
• Subtask 7: 5 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10