Submission #832493

#	Time	Username	Problem	Language	Result	Execution time	Memory
832493		ttamx	Gondola (IOI14_gondola)	C++14	100 / 100	51 ms	6308 KiB

gondola

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

using namespace std;

int valid(int n, int Seq[]){
	vector<int> s(n);
	map<int,bool> mp;
	for(int i=0;i<n;i++){
		if(mp[Seq[i]])return 0;
		mp[Seq[i]]=true;
		if(Seq[i]<=n)s[i]=Seq[i];
	}
	for(int t=0;t<2;t++){
		for(int i=0;i<n;i++){
			if(s[i]>0){
				auto &x=s[(i+1)%n];
				int val=s[i]%n+1;
				if(x==0)x=val;
				else if(x!=val)return 0;
			}
		}
	}
	return 1;
}

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

int replacement(int n, int Seq[], int Ans[]){
	vector<int> s(n);
	vector<pair<int,int>> vec;
	for(int i=0;i<n;i++){
		if(Seq[i]<=n)s[i]=Seq[i];
		else vec.emplace_back(Seq[i],i);
	}
	for(int t=0;t<2;t++)for(int i=0;i<n;i++)if(s[i]>0)s[(i+1)%n]=s[i]%n+1;
	if(s[0]==0)iota(s.begin(),s.end(),1);
	sort(vec.begin(),vec.end());
	int nxt=n+1;
	int sz=0;
	for(auto [num,pos]:vec){
		while(s[pos]!=num){
			Ans[sz++]=s[pos];
			s[pos]=nxt++;
		}
	}
	return sz;
}

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

typedef long long ll;

const ll mod=1e9+9;

ll binpow(ll a,ll b){
	ll res=1;
	while(b>0){
		if(b&1)res*=a,res%=mod;
		a*=a,a%=mod;
		b>>=1;
	}
	return res;
}

int countReplacement(int n, int Seq[]){
	if(!valid(n,Seq))return 0;
	vector<int> s(n);
	vector<int> vec;
	ll ans=n;
	for(int i=0;i<n;i++){
		if(Seq[i]<=n)s[i]=Seq[i],ans=1;
		else vec.emplace_back(Seq[i]);
	}
	sort(vec.rbegin(),vec.rend());
	vec.emplace_back(n);
	for(int i=1;i<vec.size();i++){
		ans*=binpow(i,vec[i-1]-vec[i]-1);
		ans%=mod;
	}
	return (int)ans;
}

Compilation message (stderr)

gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:41:11: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |  for(auto [num,pos]:vec){
      |           ^
gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:77:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |  for(int i=1;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: 10 / 10