#include<bits/stdc++.h>
#include "pilgrimage.h"
using namespace std;
#define int long long
typedef long long ll;

ll exgcd(ll a,ll b,ll &x,ll &y)
{
    if(!b){x=1;y=0;return a;}
    ll res=exgcd(b,a%b,x,y),t;
    t=x;x=y;y=t-a/b*y;
    return res;
}
const int N = 1e6 + 9;
ll p;
vector<int> G;
vector<int> jc[N];
inline ll power(ll a,ll b,ll mod)
{
    ll sm;
    for(sm=1;b;b>>=1,a=a*a%mod)if(b&1)
        sm=sm*a%mod;
    return sm;
}

ll fac(ll n,ll pi,ll pk)
{
    if(!n)return 1;
    ll res=1;
    res = res * jc[pi][pk] % pk;
    res=power(res,n/pk,pk);
    res = res * jc[pi][n % pk] % pk;
    return res*fac(n/pi,pi,pk)%pk;
}

inline ll inv(ll n,ll mod)
{
    ll x,y;
    exgcd(n,mod,x,y);
    return (x+=mod)>mod?x-mod:x;
}

inline ll CRT(ll b,ll mod){return b*inv(p/mod,mod)%p*(p/mod)%p;}

const int MAXN=11;

static ll n,m;

static ll w[MAXN];

inline ll C(ll n,ll m,ll pi,ll pk)
{
    ll up=fac(n,pi,pk),d1=fac(m,pi,pk),d2=fac(n-m,pi,pk);
    ll k=0;
    for(register ll i=n;i;i/=pi)k+=i/pi;
    for(register ll i=m;i;i/=pi)k-=i/pi;
    for(register ll i=n-m;i;i/=pi)k-=i/pi;
    return up*inv(d1,pk)%pk*inv(d2,pk)%pk*power(pi,k,pk)%pk;
}

inline ll exlucus(ll n,ll m)
{
    ll res=0,pk,tmp=p;
    for(auto v : G)
    {
    	int i = v;
        pk=1;while(tmp%i==0)pk*=i,tmp/=i;
      //  cout << i << " " << pk << endl;
        (res+=CRT(C(n,m,i,pk),pk))%=p;
    }
	if(tmp>1)(res+=CRT(C(n,m,tmp,tmp),tmp))%=p;
    return res;
}
inline void init(int o, int p)
{
	int tmp = p;
    for (int i = 2; i <= tmp; i++) 
    	if(tmp % i == 0)
    	{
    		G.push_back(i);
    		int pk = 1; while(tmp % i == 0) pk *= i, tmp /= i; 
    		jc[i].push_back(1); jc[i].push_back(1); int now = 1;
    		for (int j = 2; j <= pk; j++) 
    		{
    			if(j % i) now = now * j % pk; 
    			jc[i].push_back(now);
    		}
		}
}
inline int ask(int n) 
{
	int inv2 = (p + 1) / 2; 
	int ans = n % p; ans = ans * exlucus(n * 2, n) % p;
    ans = ans * power(inv2, 2 * n, p) % p;
    return ans;
}

answer.code:90:12: error: ambiguating new declaration of ‘long long int ask(long long int)’
   90 | inline int ask(int n)
      |            ^~~
In file included from answer.code:2:
pilgrimage.h:3:5: note: old declaration ‘int ask(long long int)’
    3 | int ask (long long n);
      |     ^~~