Submission #1302003

#	Time	Username	Problem	Language	Result	Execution time	Memory
1302003		h1drogen	Exam (eJOI20_exam)	C++20	14 / 100	19 ms	628 KiB

exam

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define int long long
#define ll long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define f first
#define s second  
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define imp cout<<-1<<"\n"
#define pb push_back
#define pii pair<int,int>
#define piii pair<int,pair<int,int>>
#define ls v<<1
#define rs v<<1|1
#define fast ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define ptree tree *
const int mod=1e9+7;
const int INF = 1e18;
const int N=1e6+50;
const int logn=16;
void solve(){
	int n,q,m,b,c;
	cin>>n;
	map<int,int>cnt;
	vector<int>v(n+1);
	vector<pii>pos(n);
	for(int i=1;i<=n;i++){
		cin>>v[i];
		pos[i-1].f=v[i];
		pos[i-1].s=i;
	}
	sort(all(pos));
	vector<int>g(n+1);
	for(int i=1;i<=n;i++){
		cin>>g[i];
	}
	vector<int>dp(n+1,-1);
	for(int ii=0;ii<n;ii++){
		int i=pos[ii].s;
		int val=pos[ii].f;
		// cout<<i<<" "<<val<<"\n";
		int ans=0;
		int r=i;
		int mx=0;
		for(int j=i+1;j<=n;j++){
			if(dp[j]==g[j] and dp[j]!=val){
				ans--;
			}
			if(g[j]==val){
				ans++;
			}
			if(mx<ans){
				mx=ans;
				r=j;
			}
		}
		for(int j=i;j<=r;j++){
			dp[j]=val;
		}
		ans=0;
		int l=i;
		mx=0;
		for(int j=i-1;j>0;j--){
			if(dp[j]==g[j] and dp[j]!=val){
				ans--;
			}
			if(g[j]==val){
				ans++;
			}
			if(mx<ans){
				mx=ans;
				l=j;
			}
		}
		// cout<<l<<" "<<r<<"\n";
		for(int j=l;j<=i;j++){
			dp[j]=val;
		}
	}
	int ans=0;
	for(int i=1;i<=n;i++){
		// cout<<dp[i]<<" ";
		if(dp[i]==g[i])
			ans++;
	}
	cout<<ans<<"\n";
}
signed main(){
    fast;
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22