Submission #1102902

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102902		alexander707070	Gondola (IOI14_gondola)	C++14	100 / 100	16 ms	8272 KiB

gondola

#include<bits/stdc++.h>
#include "gondola.h"

#define MAXN 500007
using namespace std;

const long long mod=1e9+9;

int n,pos;
int s[MAXN],last,maxs,where[MAXN],val[MAXN];
bool li[MAXN],dali;
long long ways;

int valid(int N, int inputSeq[]){
	n=N;

	int mins=1;
	for(int i=1;i<=n;i++){
		s[i]=inputSeq[i-1];
		s[i+n]=s[i];

		if(s[i]<s[mins]){
			mins=i;
		}
	}

	for(int i=mins;i<mins+n;i++){
		if(s[i]<=n and s[i]!=s[mins]+i-mins)return 0;

		if(s[i]>n){
			if(li[s[i]])return 0;
			li[s[i]]=true;
		}
	}

	return 1;
}

int replacement(int N, int gondolaSeq[], int replacementSeq[]){
	n=N;

	maxs=1;
	for(int i=1;i<=n;i++){
		s[i]=gondolaSeq[i-1];
		
		if(s[i]>s[maxs])maxs=i;
		if(s[i]<=n)pos=i;

		where[s[i]]=i;
	}

	if(pos==0){
		for(int i=1;i<=n;i++)val[i]=i;
	}else{
		for(int i=pos;i<=n;i++)val[i]=s[pos]+i-pos;
		for(int i=1;i<pos;i++)val[i]=val[n]+i;

		for(int i=1;i<=n;i++){
			if(val[i]>n)val[i]-=n;
		}
	}

	for(int i=n+1;i<=s[maxs];i++){
		if(where[i]==0){
			replacementSeq[i-n-1]=val[maxs];
			val[maxs]=i;
		}else{
			replacementSeq[i-n-1]=val[where[i]];
			val[where[i]]=i;
		}
	}

	return s[maxs]-n;
}

long long power(long long a,int b){
	if(b==0)return 1;
	if(b==1)return a;
	if(b==2)return (a*a)%mod;
	if(b%2==0)return power(power(a,b/2),2);
	return (power(power(a,b/2),2)*a)%mod;
}

int countReplacement(int N, int inputSeq[]){
	n=N;

	for(int i=1;i<=n;i++){
		s[i]=inputSeq[i-1];
	}

	sort(s+1,s+n+1);

	ways=1; last=n;
	for(int i=1;i<=n;i++){
		if(s[i]<=n){
			dali=true; continue;
		}

		if(!dali and last==n){
			ways*=power(n-i+1,s[i]-last);
		}else{
			ways*=power(n-i+1,s[i]-last-1);
		}
		ways%=mod;

		last=s[i];
	}

	return ways;
}

• 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