Submission #200796

#	Time	Username	Problem	Language	Result	Execution time	Memory
200796		mohammad	Gondola (IOI14_gondola)	C++14	45 / 100	81 ms	6776 KiB

gondola

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*/
 
#include<bits/stdc++.h>
#include "gondola.h"
using namespace std;
 
typedef long long ll ;
const ll oo = 4294967296 ;
const double PI = acos(-1) ;
const ll M = 1e9 + 9   ;

map<int,int> mp;
vector<pair<int,int>> v;
pair<int, int> p[1000010] ;

int valid(int n, int inputSeq[]){
	return -1 ;
}

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

int replacement(int n, int gondolaSeq[], int replacementSeq[]){
	return -2;
}

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

ll fastpower( ll x , ll n ){
	ll res = 1 ;
	while(n > 0){
		if(n % 2 == 1)
			res = (res * x) % M;
		x = ( x * x ) % M;
		n = n / 2 ;
	}
	return res;
}

int countReplacement(int n, int inputSeq[]){
	bool b = false ;
	for(int i = 0 ; i < n ; ++i){
		p[i] = {inputSeq[i] , i + 1};
		mp[inputSeq[i]]++;
		if(mp[inputSeq[i]] > 1)return 0;
		if(inputSeq[i] <= n){
			b = 1;
			int x = inputSeq[i];
			int f = i - 1;
			while(f > -1 && inputSeq[f] > n){
				x--;
				if(x == 0) x = n;
				v.push_back({inputSeq[f] , x});
				inputSeq[f] = x;
				mp[x]++;	
				if(mp[x] > 1) return 0 ;
				f--;
			}
			f = i + 1 ;
			x = inputSeq[i];
			while(f < n && inputSeq[f] > n){
				x++;
				if(x == n + 1) x = 1;
				v.push_back({inputSeq[f] , x});
				inputSeq[f] = x;
				mp[x]++;
				if(mp[x] > 1)return 0;
				f++;
			}
			i = f - 1;
		}
	}
	ll ans = 1 , ls = n + 1 , ans1 = 1;
	if(b){
		for(int i = 1 ; i < n ; ++i)
			if((inputSeq[i] == 1 && inputSeq[i - 1] != n) || (inputSeq[i] != 1 && inputSeq[i - 1] + 1 != inputSeq[i])) return 0;
		sort(v.begin(), v.end());
		int idx = 0 ;
		for(auto x : v){
			ans = (ans * fastpower(v.size() - idx , x.first - ls)) % M;
			ls = x.first + 1 ;
			idx++;
		}
	}else{
		sort(p , p + n);
		for(int i = 0 ; i < n - 1 ; ++i){
			ans = (ans * fastpower(n - i , p[i].first - ls)) % M;
			ls = p[i].first + 1;
		}
		ans = (ans * n) % M;
	}
	return ans ;
}

Compilation message (stderr)

gondola.cpp: In function 'int countReplacement(int, int*)':
gondola.cpp:89:28: warning: unused variable 'ans1' [-Wunused-variable]
  ll ans = 1 , ls = n + 1 , ans1 = 1;
                            ^~~~

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