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Submission #463393

# Submission time Handle Problem Language Result Execution time Memory
463393 2021-08-11T05:37:17 Z amunduzbaev Exam (eJOI20_exam) C++14
27 / 100
 711 ms 196688 KB 
#include "bits/stdc++.h"
using namespace std;

//~ #define int long long

void solve1(int n, vector<int>& a, vector<int>& b){
	vector<int> dp(n);
	if(n <= 5005){
		vector<array<int, 3>> tmp;
		for(int i=0;i<n;i++){
			tmp.push_back({a[i], 0, i});
			tmp.push_back({b[i], 1, i});
		}
		
		sort(tmp.begin(), tmp.end());
		for(int last=0, i=0;i<(int)tmp.size();){
			int j = i;
			while(j < (int)tmp.size() && tmp[j][0] == tmp[i][0]) j++;
			while(i < j){
				if(tmp[i][1]){
					b[tmp[i][2]] = last;
				} else {
					a[tmp[i][2]] = last;
				} i++; 
			} last++;
		}
		
		//~ for(int i=0;i<n;i++) cout<<a[i]<<" ";
		//~ cout<<endl;
		//~ for(int i=0;i<n;i++) cout<<b[i]<<" ";
		//~ cout<<endl;
		
		vector<vector<int>> cnt(2 * n, vector<int>(n));
		for(int i=0;i<n;i++){
			assert(b[i] < 2 * n);
			cnt[b[i]][i]++;
			if(i + 1 < n){
				for(int j=0;j<2*n;j++){
					cnt[j][i+1] = cnt[j][i];
				}
			}
		}

		//~ int res = 0;
		//~ for(int i=0;i<n;i++){
			//~ int s = i;
			//~ while(s + 1 < n && a[s + 1] <= a[i]) s++;
			//~ for(int r=s;r>=0;r--){
				//~ if(a[r] > a[i]) break;
				//~ for(int l=r;l>=0;l--){
					//~ if(a[l] > a[i]) break;
					//~ dp[r] = max(dp[r], cnt[a[i]][r] - (l ? cnt[a[i]][l-1] - dp[l-1] : 0));
					//~ res = max(res, dp[r]);
				//~ }
			//~ }
		//~ }
		
		int res = 0;
		for(int i=0;i<n;i++){
			int r = i, l = i;
			while(r + 1 < n && a[r + 1] <= a[i]) r++;
			while(l > 0 && a[l - 1] <= a[l]) l--;
			vector<int> cnt(n);
			for(int j=0;j<n;j++){
				 if(b[j] == a[i]) cnt[j]++;
				 if(j + 1 < n) cnt[j+1] = cnt[j];
			}

			vector<int> pref(n);
			for(int i=0;i<n;i++){
				pref[i] = max(pref[i], dp[i] - cnt[i]);
				if(i + 1 < n) pref[i+1] = pref[i];
			}

			for(int j=l;j<=r;j++){
				dp[j] = max(dp[j], cnt[j] + (j ? pref[j - 1] : 0));
			}
		}
		
		//~ for(int i=0;i<n;i++) cout<<dp[i]<<" ";
		//~ cout<<"\n";
		
		for(int i=0;i<n;i++) res = max(res, dp[i]);
		
		cout<<res<<"\n";
	} else {
		
	}
}

void solve2(int n, vector<int>& a, vector<int>& b){
	int last = 0, cnt = 0, res = 0;
	for(int i=0;i<n;i++){
		if(a[i] > b[0]){
			if(cnt){
				res += (i - last);
			}
			
			cnt = 0, last = i + 1;
		} else {
			cnt |= (a[i] == b[i]);
		}
	} if(cnt){
		res += (n - last);
	}
	
	cout<<res<<"\n";
}

void solve(){
	int n; cin>>n;
	vector<int> a(n), b(n);
	for(auto& x : a) cin>>x;
	for(auto& x : b) cin>>x;
	
	if(n <= 5005){
		solve1(n, a, b);
	} else {
		solve2(n, a, b);
	}
}

/*

3
1 2 3
2 2 2

*/

signed main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	int t = 1;
	//~ cin>>t;
	while(t--) solve();
}

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 8256 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 5 ms 2252 KB Output is correct
3 Correct 103 ms 31820 KB Output is correct
4 Correct 644 ms 181288 KB Output is correct
5 Correct 701 ms 196640 KB Output is correct
6 Correct 711 ms 196688 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 678 ms 196636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Incorrect 0 ms 204 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 5 ms 2252 KB Output is correct
9 Correct 103 ms 31820 KB Output is correct
10 Correct 644 ms 181288 KB Output is correct
11 Correct 701 ms 196640 KB Output is correct
12 Correct 711 ms 196688 KB Output is correct
13 Incorrect 0 ms 204 KB Output isn't correct
14 Halted 0 ms 0 KB -