#include <cstdio>
#include <algorithm>
#include <queue>
#include <utility>
#include <set>
#include "gondola.h"
using namespace std;
typedef pair<int,int> pi;
int valid(int n, int inputSeq[]){
set<int> s;
for (int i=0; i<n; i++) {
if(s.find(inputSeq[i]) != s.end()) return 0;
s.insert(inputSeq[i]);
}
int piv = -1;
for (int i=0; i<n; i++) {
if(inputSeq[i] <= n){
if(piv == -1){
piv = i;
}
else{
int res = i + (inputSeq[piv] - piv) + n;
res %= n;
if(res == 0) res = n;
if(inputSeq[i] != res) return 0;
}
}
}
return 1;
}
priority_queue<pi,vector<pi>,greater<pi> > pq, pq2;
int replacement(int n, int gondolaSeq[], int replacementSeq[]){
int piv = 0, piv2 = n+1, piv3 = 0;
for (int i=0; i<n; i++) {
if(gondolaSeq[i] <= n){
piv = gondolaSeq[i] - i - 1+ n;
piv %= n;
}
}
int newSeq[100005] = {};
for (int i=0; i<n; i++) {
newSeq[i] = gondolaSeq[(i + n - piv)%n];
if(newSeq[i] > n) pq.push(pi(newSeq[i],i+1));
}
while (!pq.empty()) {
pi x = pq.top();
pq.pop();
replacementSeq[piv3++] = x.second;
for (int i=piv2; i<x.first; i++) {
replacementSeq[piv3++] = i;
}
piv2 = x.first + 1;
}
return piv3;
}
long long pow(int x, int time){
long long res = 1, piv = x, mod = 1e9 + 9;
while (time) {
if(time&1) res *= piv;
piv *= piv;
res %= mod;
piv %= mod;
time >>= 1;
}
return res;
}
int newSeq[100005];
int countReplacement(int n, int inputSeq[]){
if(!valid(n,inputSeq)) return 0;
int piv = 0, piv2 = n, cnt = 0;
long long res = 1;
for (int i=0; i<n; i++) {
if(inputSeq[i] > n) newSeq[piv++] = inputSeq[i];
}
if(piv == n) res = piv;
if(piv == 0) return 1;
cnt = piv;
sort(newSeq,newSeq+piv);
for (int i=0; i<piv; i++) {
res *= pow(cnt,newSeq[i] - piv2 - 1);
piv2 = newSeq[i];
cnt--;
res %= 1000000009;
}
return (int)res;
}
