This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "gondola.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
#define F first
#define S second
#define PB push_back
#define M 1000000009LL
ll pw(ll x,ll y){
ll res=1;
while(y){
if(y&1)res=res*x%M;
y>>=1;
x=x*x%M;
}
return res;
}
int n,x[100005];
set<int>p;
int valid(int N,int a[]){
n=N;
int b=-1,c;
for(int i=0;i<n;i++){
if(a[i]<=n){
if(b!=-1&&(b+i-c)%n+1!=a[i])return 0;
b=a[i]-1,c=i;
}else{
if(p.find(a[i])!=p.end())return 0;
p.insert(a[i]);
}
}
return 1;
}
//----------------------
int replacement(int N,int a[],int r[]){
n=N;
int b=0,c=0;
for(int i=0;i<n;i++)if(a[i]<=n)b=a[i]-1,c=i;
for(int i=0;i<n;i++){
x[(c+i)%n]=(b+i)%n+1;
}
vector<P>g;
for(int i=0;i<n;i++)if(a[i]>n)g.PB(P(a[i],i));
sort(g.begin(),g.end());
int d=n+1,k=0;
for(int i=0;i<g.size();i++){
int q=g[i].S;
while(x[q]<a[q]){
r[k++]=x[q];
x[q]=d++;
}
}
return k;
}
//----------------------
int countReplacement(int N,int a[]){
n=N;
if(valid(n,a)==0)return 0;
vector<P>g;
for(int i=0;i<n;i++)if(a[i]>n)g.PB(P(a[i],i));
sort(g.begin(),g.end());
ll u=n,s=g.size(),ans=1LL;
for(ll i=0;i<s;i++){
ll t=g[i].F;
ans=ans*pw(s-i,t-u-1LL)%M;
u=t;
}
if(s==n)ans=ans*ll(n)%M;
return ans;
}
Compilation message (stderr)
gondola.cpp: In function 'int replacement(int, int*, int*)':
gondola.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<g.size();i++){
~^~~~~~~~~
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