Submission #588449

#	Time	Username	Problem	Language	Result	Execution time	Memory
588449		dozer	Exam (eJOI20_exam)	C++14	13 / 100	345 ms	197584 KiB

exam

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sp " "
#define endl "\n"
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define N 5005
#define pii pair<int, int>
#define st first
#define nd second
#define modulo 1000000007
#define LOGN 18
#define int long long


int a[N], b[N];
int dp[N][N];
map<int, int> val;


int f(int i, int j)
{
	if (i == 0 || j == 0) return 0;
	if (dp[i][j] != -1) return dp[i][j];
	int ans = f(i, j - 1);
	if (b[j] == a[i]) ans++;
	ans = max(ans, f(i - 1, min(j, i - 1)));
	return dp[i][j] = ans;
}

int32_t main()
{
	fastio();

	memset(dp, -1, sizeof(dp));
	int n;
	cin>>n;
	set<int> s;
	for (int i = 1; i <= n; i++)
	{
		cin>>a[i];
		s.insert(a[i]);
	}
	int cntr = 1;
	for (auto i : s)
	{
		val[i] = cntr;
		cntr++;
	}
	for (int i = 1; i <= n; i++)
		a[i] = val[a[i]];

	for (int i = 1; i <= n; i++)
	{
		cin>>b[i];
		b[i] = val[b[i]];
	}
	
	cout<<f(n, n)<<endl;
	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

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