Submission #702567

#	Time	Username	Problem	Language	Result	Execution time	Memory
702567		jamezzz	Gondola (IOI14_gondola)	C++17	75 / 100	49 ms	7224 KiB

gondola

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

#define mod 1000000009

int valid(int n,int inputSeq[]){
	int offset=-1;
	set<int> s;
	for(int i=0;i<n;++i){
		if(s.find(inputSeq[i])!=s.end())return 0;
		s.insert(inputSeq[i]);
		if(inputSeq[i]<=n){
			if(offset==-1)offset=(inputSeq[i]-i-1+n)%n;
			else if(offset!=(inputSeq[i]-i-1+n)%n)return 0;
		}
	}
	return 1;
}

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

int replacement(int n, int gondolaSeq[], int replacementSeq[]){
	set<int> changed;
	map<int,int> pos;
	int offset=0,dummy=0,cur=0;
	int mx=0;
	for(int i=0;i<n;++i){
		if(gondolaSeq[i]<=n)offset=(gondolaSeq[i]-1-i+n)%n;
		else{
			changed.insert(gondolaSeq[i]);
			if(gondolaSeq[i]>gondolaSeq[dummy])dummy=i;
		}
		mx=max(mx,gondolaSeq[i]);
	}
	for(int i=0;i<n;++i){
		if(gondolaSeq[i]>n){
			pos[gondolaSeq[i]]=((i+offset)%n)+1;
		}
	}
	cur=(dummy+offset)%n+1;
	int ori=cur;
	for(int i=n+1;i<=mx;++i){
		if(changed.find(i)==changed.end()||pos[i]==ori){
			replacementSeq[i-n-1]=cur;
			cur=i;
		}
		else{
			replacementSeq[i-n-1]=pos[i];
		}
	}
	return mx-n;
}

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

int fp(int x,int a){
	if(a==0)return 1;
	int t=fp(x,a/2);
	long long r=((long long)t*t)%mod;
	if(a%2)r=(r*x)%mod;
	return (int)r;
}

int countReplacement(int n, int inputSeq[]){
	set<int> changed;
	int mx=0;
	for(int i=0;i<n;++i){
		if(inputSeq[i]>n){
			changed.insert(inputSeq[i]);
			mx=max(mx,inputSeq[i]);
		}
	}
	long long ans=valid(n,inputSeq);
	if(changed.size()==0)return (int)ans;
	int num=1;
	int pv=*(--changed.end());
	changed.erase(--changed.end());
	while(!changed.empty()){
		int x=*(--changed.end());
		changed.erase(--changed.end());
		ans=(ans*fp(num,pv-x-1))%mod;
		pv=x;
		++num;
	}
	ans=(ans*fp(num,pv-n-1))%mod;
	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: 0 / 15
• Subtask 10: 0 / 10