// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define ordered_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
#define len(x) (int)x.size()
#define ull unsigned long long
#define F first
#define S second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define int long long
using namespace std;
using namespace __gnu_pbds;
using ll = long long;
const int N = 2e5 + 5;
const int MOD = 1e9 + 7;
int n,a[N],b[N],ans,c[N];
rec(int l = 0){
int cnt = 0;
for (int i=1;i<=n;i++){
if (a[i]==b[i]) cnt++;
}
ans = max(ans, cnt);
for (int i=l+1;i<=n;i++){
for (int j=i+1;j<=n;j++){
int mx = 0;
for (int k=i;k<=j;k++){
mx = max(a[k],mx);
}
for (int k=i;k<=j;k++){
c[k] = a[k];
a[k] = mx;
}
rec(j + 1);
for (int k=i;k<=j;k++){
a[k] = c[k];
}
}
}
}
main(){
// freopen("txt.in", "r", stdin);
// freopen("txt.out", "w", stdout);
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n;
for (int i=1;i<=n;i++){
cin >> a[i];
}
for (int i=1;i<=n;i++){
cin >> b[i];
}
rec();
cout << ans;
}
//order_of_key(k): Number of items strictly smaller than k .
//find_by_order(k): K-th element in a set (counting from zero).
//sum of squares n*(n+1)*(2n+1)/6
//sum of cubes [n*(n+1)/2]^2
//sum of squares for odds n*(4*n*n-1)/3
//sum of cubes for odds n*n*(2*n*n-1)
//a/b%mod = a*(b^(m-2)%mod)
//(a>>x)&1 == 0
//a^b = (a+b)-2(a&b)
//srand(time(0))-always changing
Compilation message
exam.cpp:26:1: error: ISO C++ forbids declaration of 'rec' with no type [-fpermissive]
26 | rec(int l = 0){
| ^~~
exam.cpp: In function 'int rec(long long int)':
exam.cpp:48:1: warning: no return statement in function returning non-void [-Wreturn-type]
48 | }
| ^
exam.cpp: At global scope:
exam.cpp:50:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
50 | main(){
| ^~~~
