Submission #833400

#	Time	Username	Problem	Language	Result	Execution time	Memory
833400		vjudge1	Exam (eJOI20_exam)	C++17	39 / 100	1065 ms	4956 KiB

exam

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

#define pb push_back
#define mp make_pair
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>

const int INF = 2147483645;
const int maxN = (int)1e5+5;
const ll LLINF = LLONG_MAX;
//const ll mod = 998244353;
const ll mod = 1000000007;

ll dp[maxN];
vector<int> v;

ll lis (ll n) {
	ll mx = 0;
	for (int i=0; i<n; i++) {
		for (int j=0; j<i; j++) {
			if (v[i] >= v[j]) { 
				dp[i] = max(dp[i], dp[j] + 1);
			}
		}
	}
	for (int i=0;i<n;i++) {
		mx = max(mx, dp[i]);
	}
	return mx+1;
}

void st1(vector<int> h, vector<int> t) {
	int n = h.size();
	vector<pii> v;
	for (int i=0;i<n;i++) {
		v.pb(mp(h[i], i));
	}
	sort(v.begin(), v.end());
	for (int i=0;i<n;i++) {
		int idx = v[i].second;
		int l[maxN]={}, r[maxN]={};
		int ctr=0, img=0, tmp=idx-1;
		while (tmp >= 0 && h[tmp] <= h[idx]) {
			if (h[idx] == t[tmp]) img++;
			if (h[tmp] == t[tmp]) ctr++;
			l[tmp] = img-ctr;
			tmp--;
		}
		int leftest = tmp+1;
		tmp = idx+1; ctr = 0; img = 0;
		while (tmp < n && h[tmp] <= h[idx]) {
			if (h[idx] == t[tmp]) img++;
			if (h[tmp] == t[tmp]) ctr++;
			r[tmp] = img-ctr;
			tmp++;
		}
//		cout<<ctr<<" "<<img<<'\n';
		int rightest = tmp;
		int mxl = 0, mxr = 0, lidx=idx, ridx=idx;
		for (int j=leftest;j<idx;j++) {
			if (mxl < l[j]) {
				mxl = l[j];
				lidx = j;
			}
		}
		for (int j=idx+1;j<rightest;j++) {
			if (mxr < r[j]) {
				mxr = r[j];
				ridx = j;
			}
		}
//		cout<<h[idx]<<" "<<lidx<<" "<<ridx<<" "<<'\n';
		for (int j=lidx;j<=ridx;j++) {
			h[j] = h[idx];
		}
	}
	int ans = 0;
	for (int i=0;i<n;i++) {
		if (h[i] == t[i]) ans++;
	}
	cout<<ans<<'\n';
}

void st3(vector<int> h, vector<int> t) {
	map<int, int> idx;
	int n = h.size();
	for (int i=0;i<n;i++) idx[h[i]] = i;
	for (int i=0;i<n;i++) {
		if (idx.count(t[i]) && i <= idx[t[i]]) v.pb(t[i]);
	}
	cout<<lis(v.size())<<'\n';
}

void solv() {
	int n, a, ans=0;
	vector<int> h, t;
	bool inc = true, same = true;
	cin>>n;
	for (int i=0;i<n;i++) {
		cin>>a, h.pb(a);
		if (i > 0) {
			if (a <= h[i-1]) inc = false;
		}
	}
	for (int i=0;i<n;i++) {
		cin>>a, t.pb(a);
		if (a != t[0]) same = false;
	}
	if (inc) {
		st3(h, t);
		return;
	}
	if (!same) {
		st1(h, t);
		return;
	}
	for (int i=0;i<n;i++) {
		if (h[i] != a) continue;
		int tmp = i-1;
		while (tmp >= 0 && h[tmp] <= a) {
			ans++, tmp--;
		}
		while (i < n && h[i] <= a) {
			ans++, i++;
		}
	}
	cout<<ans<<'\n';
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int t=1;
//	cin>>t;
	while (t--) solv();
}

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