Submission #833483

#	Time	Username	Problem	Language	Result	Execution time	Memory
833483		vjudge1	Exam (eJOI20_exam)	C++17	12 / 100	58 ms	2404 KiB

exam

#include<bits/stdc++.h>
#define ll long long
#define pll pair<ll,ll>
#define pb push_back
#define fi first
#define se second
using namespace std;
const ll INF=1e10;
ll n, h[100010], t[100010], dp[100010], ans;
bool vis[100010], ok[100010];
vector<ll> tmp;

void brute(){
	for(ll mask=0; mask<=1<<10-1; mask++){
		
	}
}

void sub2(){
	for(auto i : tmp){
		vis[i]=1; 
		ans++;
		ll l=i, r=i;
		while(l-1>=1 && !vis[l-1]){
			l--;
			vis[l]=1;
			if(h[l]>=h[i]) break;
			ans++;
		}
		while(r+1<=n && !vis[r+1]){
			r++;
			vis[r]=1;
			if(h[r]>=h[i]) break;
			ans++;
		}
	}	
}

void sub3(){
	set<ll> tmp;
	for(ll i=n; i>=1; i--){
		tmp.insert(h[i]);
		if(tmp.find(t[i])!=tmp.end()){
			ok[i]=1;
		}
	}
	vector<ll> lis;
	for(int i=1; i<=n; i++){
		if(ok[i]) lis.pb(i);
	}
	int sz=lis.size();
	for(int i=0; i<sz; i++){
		dp[i]=INF;
	}
	for(int i=0; i<sz; i++) {
		int idx=(lower_bound(dp, dp+sz, lis[i])-dp);
		dp[idx]=lis[i];
	}
	for(int i=0; i<sz; i++) {
		if (dp[i]<INF) ans=i+1;
	}
}

int main(){
	bool s2=1, s3=1;
	cin >> n;
	for(ll i=1; i<=n; i++){
		cin >> h[i];
		if(i>1 && h[i-1]>=h[i]) s3=0;
	}
	for(ll i=1; i<=n; i++){
		cin >> t[i];
		if(t[i]==h[i]){
			tmp.pb(i);
		}
		if(i>1 && t[i]!=t[i-1]) s2=0;	
	}

	if(s2){
		sub2();
	}
	else if(s3){
		sub3();
	}
	else{
		brute();
	}
	cout << ans << endl;
	return 0;
}

Compilation message (stderr)

exam.cpp: In function 'void brute()':
exam.cpp:14:28: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   14 |  for(ll mask=0; mask<=1<<10-1; mask++){
      |                          ~~^~

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