Submission #586585

#	Time	Username	Problem	Language	Result	Execution time	Memory
586585		Red_Inside	Gondola (IOI14_gondola)	C++17	90 / 100	37 ms	4592 KiB

gondola

#include "gondola.h"

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define forn(j, i, n) for(int i = j; i <= n; ++i)
#define FOR(j, i, n) for(int i = j; i < n; ++i)
#define nfor(j, i, n) for(int i = n; i >= j; --i)
#define IOS ios_base::sync_with_stdio(false), cin.tie(), cout.tie();
#define all(v) v.begin(), v.end()
#define pb push_back

const int maxn = 3e5+100;

//#define int ll
#define pii pair <int, int>
int inf = 1e9;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int a[maxn], was[maxn], b[maxn];

int valid(int n, int inputSeq[])
{
	forn(1, i, n)
	{
		a[i] = inputSeq[i-1];
		was[a[i]]++;
		if(was[a[i]] >= 2)
		{
			return 0;
		}
	}
	int start = -1;
	forn(1, i, n)
	{
		if(a[i] <= n)
		{
			start = i - a[i] + 1;
			break;
		}
	}
	if(start == -1) return 1;
	forn(1, i, n)
	{
		b[(i-start+n)%n+1] = a[i];
	}
	forn(1, i, n)
	{
		if(b[i] > n) continue;
		if(b[i] != i) return 0;
	}
	return 1;
}

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
	forn(1, i, n)
	{
		a[i] = gondolaSeq[i-1];
	}
	int start = -1;
	forn(1, i, n)
	{
		if(a[i] <= n)
		{
			start = i - a[i] + 1;
			break;
		}
	}
	if(start == -1)
	{
		set <pii> st;
		forn(1, i, n)
		{
			if(a[i] > n)
			{
				st.insert({a[i], i});
			}
		}
		int cur = 0;
		while(st.size())
		{
			replacementSeq[cur] = st.begin()->s;
			cur++;
			while(n + cur < st.begin()->f)
			{
				replacementSeq[cur] = n + cur;
				cur++;
			}
			st.erase(st.begin());
		}
		return cur;
	}
	forn(1, i, n)
	{
		b[(i-start+n)%n+1] = a[i];
	}
	set <pii> st;
	forn(1, i, n)
	{
		if(b[i] > n)
		{
			st.insert({b[i], i});
		}
	}
	int cur = 0;
	while(st.size())
	{
		replacementSeq[cur] = st.begin()->s;
		cur++;
		while(n + cur < st.begin()->f)
		{
			replacementSeq[cur] = n + cur;
			cur++;
		}
		st.erase(st.begin());
	}
	return cur;
}

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

ll mod = 1e9+9;

ll binpow(ll a, ll n)
{
	ll res = 1;
	while(n)
	{
		if(n&1)
		{
			res = res * a % mod;
		}
		a = a * a % mod;
		n /= 2;
	}
	return res;
}

int countReplacement(int n, int inputSeq[])
{
	if(!valid(n, inputSeq))
	{
		return 0;
	}
	
	forn(1, i, n)
	{
		a[i] = inputSeq[i-1];
	}
	int start = -1;
	forn(1, i, n)
	{
		if(a[i] <= n)
		{
			start = i - a[i] + 1;
			break;
		}
	}
	if(start == -1)
	{
		set <pii> st;
		forn(1, i, n)
		{
			if(a[i] > n)
			{
				st.insert({a[i], i});
			}
		}
		ll ans = 1;
		int last = n;
		while(st.size())
		{
			ans *= binpow((ll)(st.size()), st.begin()->f - last - 1);
			ans %= mod;
			last = st.begin()->f;
			st.erase(st.begin());
		}
		return ans * n % mod;
	}
	forn(1, i, n)
	{
		b[(i-start+n)%n+1] = a[i];
	}
	set <pii> st;
	forn(1, i, n)
	{
		if(b[i] > n)
		{
			st.insert({b[i], i});
		}
	}
	ll ans = 1;
	int last = n;
	while(st.size())
	{
		ans *= binpow((ll)(st.size()), st.begin()->f - last - 1);
		ans %= mod;
		last = st.begin()->f;
		st.erase(st.begin());
	}
	return 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: 0 / 10