oj.uz

Submission #463386

# Submission time Handle Problem Language Result Execution time Memory
463386 2021-08-11T05:02:37 Z amunduzbaev Exam (eJOI20_exam) C++14
42 / 100
 31 ms 1112 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 <= 205){
		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]);
				}
			}
		}
		
		//~ for(int i=0;i<n;i++) cout<<dp[i]<<" ";
		//~ cout<<"\n";
		
		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 <= 205){
		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 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 204 KB Output is correct
2 Correct 8 ms 460 KB Output is correct
3 Correct 26 ms 1032 KB Output is correct
4 Correct 15 ms 1100 KB Output is correct
5 Correct 31 ms 1112 KB Output is correct
6 Correct 19 ms 1112 KB Output is correct
7 Correct 16 ms 1108 KB Output is correct
8 Correct 28 ms 1100 KB Output is correct

Subtask #3
0 / 13.0

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

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 3 ms 660 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 1 ms 588 KB Output is correct
13 Correct 2 ms 588 KB Output is correct
14 Correct 5 ms 588 KB Output is correct

Subtask #6
0 / 22.0

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