Submission #832397

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
832397	2023-08-21T09:59:24 Z	vjudge1	Exam (eJOI20_exam)	C++14	25 / 100	347 ms	524288 KB

exam

#include<bits/stdc++.h>

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;

#define ll long long
#define rep(i,n,N) for(int i = n; i<=N; ++i)
#define rap(i,n,N) for(int i = n; i>=N; --i)
#define For(i,n,N) for(int i = n; i< N; ++i)
#define endl '\n'
#define pb push_back
#define all(x) x.begin(),x.end()
#define mems(x,y) memset(x,y,sizeof x)
#define ari(x) array<int,x>
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fi first
#define se second
const int MAX = 1e5 + 5;
mt19937 rng(time(NULL));

int n,x[MAX],y[MAX],cnt,dp2[5005][5005],dp[505][505][505][2];
vector<int> v,a,b;
bool vis[MAX],gg;
int pf[505][505];

int g(int nw,int val){
	val = max(nw, val);
	if(val>n || nw>n)return 0;
	int &ret = dp2[nw][val];
	if(ret!=-1)return ret;
	return ret = max(g(nw+1,val) + (y[nw]==val), g(nw, val+1));
}

int f(int le,int ri,int val,bool st){
	if(le>ri || val>n)return 0;
	int &ret = dp[le][ri][val][st];
	if(ret!=-1)return ret;
	ret = max({f(le+1,ri,val,st), f(le,ri-1,val,st), f(le,ri,val+1,0)});
	if(!st && pf[val][ri]-pf[val][le-1])ret = max(ret, f(le,ri,val,1));
	
	if(st){// val ada
		if(x[le]<=val && y[le]==val)ret = max(ret, f(le+1,ri,val,st) + 1);
		if(x[ri]<=val && y[ri]==val)ret = max(ret, f(le,ri-1,val,st) + 1);
	}
	
	return ret;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin>>n;
	rep(i,1,n)cin>>x[i], v.pb(x[i]);
	sort(all(v));
	v.erase(unique(all(v)), v.end());
	rep(i,1,n)x[i] = upper_bound(all(v), x[i]) - v.begin();
	auto it = v.begin();
	rep(i,1,n){
		cin>>y[i];
		it = lower_bound(all(v), y[i]);
		y[i] = it==v.end() || *it!=y[i] ? 0 : it-v.begin()+1;
	}
	
//	cout<<"____\n";
//	rep(i,1,n)cout<<x[i]<<" "; cout<<endl;
//	rep(i,1,n)cout<<y[i]<<" "; cout<<endl;
	
	x[0] = x[n+1] = v.size()+1;
	
	bool tc2 = 1;
	rep(i,2,n)if(y[i]!=y[i-1])tc2 = 0;
	if(tc2){
		gg = 0;
		rep(i,1,n){
			if(x[i]==y[i])gg = 1;
			else if(x[i]>y[i])gg = 0;
			vis[i]|= gg;
		}
		gg = 0;
		rap(i,n,1){
			if(x[i]==y[i])gg = 1;
			else if(x[i]>y[i])gg = 0;
			vis[i]|= gg;
			cnt+= vis[i];
		}
		cout<<cnt<<endl;
		return 0;
	}
	
	bool tc3 = 1;
	rep(i,1,n)if(x[i]!=i)tc3 = 0;
	if(tc3){
		mems(dp2, -1);
		cout<<g(1,1)<<endl;
		return 0;
	}
	
	if(n<=500){
		rep(i,1,n){
			rep(j,1,n)pf[j][i] = pf[j][i-1];
			pf[x[i]][i]++;
		}
		mems(dp, -1);
		cout<<f(1,n,0,0)<<endl;
		return 0;
	}
	return 0;
}

Subtask #1
0 / 14.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	190 ms	524288 KB	Execution killed with signal 9
2	Halted	0 ms	0 KB	-

Subtask #2
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	6 ms	672 KB	Output is correct
3	Correct	19 ms	1580 KB	Output is correct
4	Correct	11 ms	1676 KB	Output is correct
5	Correct	45 ms	1644 KB	Output is correct
6	Correct	14 ms	1748 KB	Output is correct
7	Correct	16 ms	1704 KB	Output is correct
8	Correct	35 ms	1692 KB	Output is correct

Subtask #3
13.0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	35 ms	98260 KB	Output is correct
2	Correct	38 ms	98416 KB	Output is correct
3	Correct	72 ms	98628 KB	Output is correct
4	Correct	301 ms	99064 KB	Output is correct
5	Correct	347 ms	99100 KB	Output is correct
6	Correct	344 ms	99044 KB	Output is correct