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답안 #463416

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
463416 2021-08-11T06:17:50 Z amunduzbaev Exam (eJOI20_exam) C++14
55 / 100
 115 ms 1116 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){
		int res = 0;
		for(int i=0;i<n;i++){
			int s = i, e = i;
			while(s + 1 < n && a[s + 1] <= a[i]) s++;
			while(e && a[e - 1] <= a[i]) e--;

			vector<int> cnt(n);
			for(int j=0;j<n;j++){
				if(j) cnt[j] = cnt[j-1];
				cnt[j] += (b[j] == a[i]);
			}

			for(int r=s;r>=e;r--){
				int mx = -1e9;
				for(int l=r;l>=e;l--){
					mx = max((l ? - cnt[l-1] + dp[l-1] : 0), mx);
					//~ mx = max(mx, (l ? - cnt[l-1] + dp[l-1] : 0));
				}
				
				dp[r] = max(dp[r], cnt[r] + mx);
			}
		}
		
		for(int i=0;i<n;i++) res = max(res, dp[i]);
		cout<<res<<"\n";
	} else {
		int res;
		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), pref(n);
			for(int j=0;j<n;j++){
				if(j) cnt[j] = cnt[j-1];
				cnt[j] += (b[j] == a[i]);
			}
 
			for(int i=l;i<=r;i++){
				if(i) pref[i] = pref[i-1];
				pref[i] = max(pref[i], (i ? dp[i - 1] - cnt[i - 1] : 0));
			}
 
			for(int j=l;j<=r;j++){
				dp[j] = max(dp[j], cnt[j] + pref[j]);
			}
		}
 
		for(int i=0;i<n;i++) res = max(res, dp[i]);
		cout<<res<<"\n";
	}
}
 
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;
	
	int mx = 0, mn = 1e9;
	for(auto x : b) mx = max(mx, x), mn = min(mn, x);
	if(mx == mn){
		solve2(n, a, b);
		return;
	}
	
	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();
}

Compilation message

exam.cpp: In function 'void solve1(int, std::vector<int>&, std::vector<int>&)':
exam.cpp:35:7: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |   int res;
      |       ^~~

Subtask #1
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 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 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 5 ms 460 KB Output is correct
3 Correct 19 ms 972 KB Output is correct
4 Correct 15 ms 1108 KB Output is correct
5 Correct 28 ms 1116 KB Output is correct
6 Correct 15 ms 1116 KB Output is correct
7 Correct 16 ms 1100 KB Output is correct
8 Correct 25 ms 1100 KB Output is correct

Subtask #3
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 204 KB Output is correct
3 Correct 18 ms 332 KB Output is correct
4 Correct 106 ms 388 KB Output is correct
5 Correct 115 ms 332 KB Output is correct
6 Correct 114 ms 388 KB Output is correct

Subtask #4
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 40 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 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 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 2 ms 308 KB Output is correct

Subtask #6
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 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 1 ms 204 KB Output is correct
5 Correct 1 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 2 ms 204 KB Output is correct
9 Correct 18 ms 332 KB Output is correct
10 Correct 106 ms 388 KB Output is correct
11 Correct 115 ms 332 KB Output is correct
12 Correct 114 ms 388 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 2 ms 308 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Incorrect 2 ms 332 KB Output isn't correct
23 Halted 0 ms 0 KB -