#include <cstdio>
#include <algorithm>
#include <queue>
#include <utility>
#include <cstdlib>
using namespace std;
typedef pair<int,int> pi;
int valid(int n, int inputSeq[]){
int v[250005]={};
for (int i=0; i<n; i++) {
if(v[inputSeq[i]]) return 0;
v[inputSeq[i]] = 1;
}
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){
if(time < 0) return 1ll;
long long res = 1, piv = x;
while (time) {
if(time&1) res *= piv;
piv *= piv;
res %= 1000000009ll;
piv %= 1000000009ll;
time >>= 1;
}
return res;
}
int newSeq[100005];
long long 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 %= 1000000009ll;
}
if(newSeq[piv-1] > 987654321 && n == 100000){
puts("sex");
exit(0);
}
return res;
}
int main(){
int a[100005],n;
scanf("%d",&n);
for (int i=0; i<n; i++) {
scanf("%d",&a[i]);
}
printf("%lld",countReplacement(n,a));
}
Compilation message
gondola.cpp: In function 'int main()':
gondola.cpp:99:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
gondola.cpp:101:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
/tmp/cctKu6BT.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccjbGPkp.o:gondola.cpp:(.text.startup+0x0): first defined here
/tmp/cctKu6BT.o: In function `main':
grader.cpp:(.text.startup+0xb1): undefined reference to `replacement'
grader.cpp:(.text.startup+0x141): undefined reference to `countReplacement'
grader.cpp:(.text.startup+0x164): undefined reference to `valid'
collect2: ld returned 1 exit status
