Language: C++

#include <bits/stdc++.h>
using namespace std;

#define inf 1072114514
#define llinf 4154118101919364364
#define mod 1000000007
#define pi 3.1415926535897932384


int round(int a,int b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;} 
int gcd(int a,int b){int c;while(b!=0){c=a%b;a=b;b=c;}return a;}    //最大公約数
int lcm(int a,int b){int c=gcd(a,b);a/=c;return a*b;}     //最小公倍数
int nCr(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;} //コンビネーション
int nHr(int a,int b){return nCr(a+b-1,b);}       // 重複組み合わせ
int fact(int a){int i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}  //階乗
int pow(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=a;}return r;} // a~bまでの階乗
int dsum(int x){int r=0;while(x){r+=(x%10);x/=10;}return r;}   //数字の各位の和
int dsumb(int x,int b){int r=0;while(x){r+=(x%b);x/=b;}return r;}  // b進数の各位の和？
int sankaku(int x){return ((1+x)*x)/2;} //三角数 xまでの和

//以下long long ver
long long llmax(long long a,long long b){if(a>b){return a;}return b;}
long long llmin(long long a,long long b){if(a<b){return a;}return b;}
long long llzt(long long a,long long b){return llmax(a,b)-llmin(a,b);}
long long llround(long long a,long long b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;}
long long llceil(long long a,long long b){if(a%b==0){return a/b;}return (a/b)+1;}
long long llgcd(long long a,long long b){long long c;while(b!=0){c=a%b;a=b;b=c;}return a;}
long long lllcm(long long a,long long b){long long c=llgcd(a,b);a/=c;return a*b;}
long long llnCr(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
long long llnHr(long long a,long long b){return llnCr(a+b-1,b);}
long long llfact(long long a){long long i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}
long long llpow(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}
long long lldsum(long long x){long long r=0;while(x){r+=(x%10);x/=10;}return r;}
long long lldsumb(long long x,long long b){long long r=0;while(x){r+=(x%b);x/=b;}return r;}
long long llsankaku(long long x){return ((1+x)*x)/2;}

//double
double dbmax(double a,double b){if(a>b){return a;}return b;}
double dbmin(double a,double b){if(a<b){return a;}return b;}
double dbzt(double a,double b){return dbmax(a,b)-dbmin(a,b);}


typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;
#define forr(i,a,b) ; for(int i=(a); i<(b); i++)
#define clean(arr,val) memset(arr,val,sizeof(arr))
#define forn(i,n) forr(i,0,n)
#define PB push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vpll;
const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
bool is_prime (int x){
  if (x<=1) return false ;
  for (int i=2 ; i*i<=x ; i++){
    if (x%i==0) return false ;
  }
   return true;
}

 
/*CODE START HERE*/
int main() {
  int n;
  cin >> n
   vector<int> v(n) ,a(n),b(n);
  forn(i,n){
    v.at(i) = i+1 ;
  }
  forn(i,n){
    cin >> a.at(i) ;
  }
  forn(i,n){
    cin >> b.at(i) ;
  }
  int junban = 1;
  int a_num = 0;
  int b_num = 0 ;
   while (next_permutation(v.begin(), v.end()){
     bool A = true;
     bool B = true ;
     forn ( i,n){
     if (a.at(i) !=v.at(i)){
       A = false ;
     }
     if (b.at(i) != v.at(i)){
       B = false ;
     }
       }
     if ( A){
       a_num = junban ;
     }
     if (B){
       b_num = junban ;
     }
     junban ++ ;
   }
          cout << abs(a_num-b_num) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:68:11: error: expected ';' before 'vector'
   68 |   cin >> n
      |           ^
      |           ;
   69 |    vector<int> v(n) ,a(n),b(n);
      |    ~~~~~~  
a.cc:71:5: error: 'v' was not declared in this scope
   71 |     v.at(i) = i+1 ;
      |     ^
a.cc:74:12: error: 'a' was not declared in this scope
   74 |     cin >> a.at(i) ;
      |            ^
a.cc:77:12: error: 'b' was not declared in this scope
   77 |     cin >> b.at(i) ;
      |            ^
a.cc:82:28: error: 'v' was not declared in this scope
   82 |    while (next_permutation(v.begin(), v.end()){
      |                            ^
a.cc:82:47: error: expected ')' before '{' token
   82 |    while (next_permutation(v.begin(), v.end()){
      |          ~                                    ^
      |                                               )
a.cc:86:10: error: 'a' was not declared in this scope
   86 |      if (a.at(i) !=v.at(i)){
      |          ^
a.cc:89:10: error: 'b' was not declared in this scope
   89 |      if (b.at(i) != v.at(i)){
      |          ^