oj.uz

Submission #463418

# Submission time Handle Problem Language Result Execution time Memory
463418 2021-08-11T06:21:50 Z amunduzbaev Exam (eJOI20_exam) C++14
39 / 100
 130 ms 1108 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]);
			}

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

			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] + pref[r]);
			}
		}
		
		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:41:7: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   41 |   int res;
      |       ^~~

Subtask #1
14.0 / 14.0

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

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 5 ms 460 KB Output is correct
3 Correct 18 ms 1024 KB Output is correct
4 Correct 15 ms 1100 KB Output is correct
5 Correct 27 ms 1100 KB Output is correct
6 Correct 15 ms 1104 KB Output is correct
7 Correct 16 ms 1108 KB Output is correct
8 Correct 25 ms 1100 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 324 KB Output is correct
3 Correct 18 ms 352 KB Output is correct
4 Correct 103 ms 332 KB Output is correct
5 Correct 130 ms 384 KB Output is correct
6 Correct 127 ms 388 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 40 ms 388 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 1 ms 204 KB Output is correct
3 Correct 1 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 1 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 1 ms 204 KB Output is correct
3 Correct 1 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 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 2 ms 324 KB Output is correct
9 Correct 18 ms 352 KB Output is correct
10 Correct 103 ms 332 KB Output is correct
11 Correct 130 ms 384 KB Output is correct
12 Correct 127 ms 388 KB Output is correct
13 Incorrect 0 ms 204 KB Output isn't correct
14 Halted 0 ms 0 KB -