Submission #833037

#	Time	Username	Problem	Language	Result	Execution time	Memory
833037		vjudge1	Exam (eJOI20_exam)	C++14	39 / 100	35 ms	67752 KiB

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[205][205][205][2];
vector<int> v,a,b;
bool vis[MAX],gg;
int pf[205][205];

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;
}

#define lc (id<<1)
#define rc ((id<<1)|1)

struct rmqSegtree{
	int tree[1<<18];
	int n,a,b;
	void build(int id,int le,int ri){
		if(le==ri){
			tree[id] = x[le];
			return;
		}
		int mid = le+ri>>1;
		build(lc,le,mid), build(rc,mid+1,ri);
		tree[id] = max(tree[lc], tree[rc]);
		return;
	}
	int que(int id,int le,int ri){
		if(le>b || ri<a)return 0;
		if(le>=a && ri<=b)return tree[id];
		int mid = le+ri>>1;
		return max(que(lc,le,mid), que(rc,mid+1,ri));
	}
	int que(int L,int R){
		a = L, b = R;
		return que(1,1,n);
	}
}rmq;

struct ansSegtree{
	int tree[1<<18];
	int n,val,a,b;
	void upd(int id,int le,int ri){
		if(le==ri){
			tree[id] = val;
			return;
		}
		int mid = le+ri>>1;
		if(a<=mid)upd(lc,le,mid);
		else upd(rc,mid+1,ri);
		tree[id] = max(tree[lc], tree[rc]);
		return;
	}
	int que(int id,int le,int ri){
		if(le>b || ri<a)return 0;
		if(le>=a && ri<=b)return tree[id];
		int mid = le+ri>>1;
		return max(que(lc,le,mid), que(rc,mid+1,ri));
	}
	int que(int L,int R){
		a = L, b = R;
		return que(1,1,n);
	}
	void upd(int pos,int _v){
		a = pos;
		val = _v;
		upd(1,1,n);
	}
}tree[2];

int z[MAX];

int main(){
//	freopen("input.4_a", "r", stdin);
	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 tc4 = v.size()==n;
	if(tc4){
		rmq.n = tree[0].n = tree[1].n = n;
		reverse(x+1, x+1+n);
		reverse(y+1, y+1+n);
		rmq.build(1,1,n);
		rep(i,1,n)z[x[i]] = i;
		int pos,val;
		rep(i,1,n)if(x[i]<=y[i]){
			pos = z[y[i]];
			if(pos>=i){
				if(rmq.que(i,pos)!=y[i])continue;
				val = max(tree[0].que(1,y[i]), tree[1].tree[1]) + 1;
				tree[0].upd(y[i], val);
				if(pos==i)tree[1].upd(y[i], val);
			}
			else {
				if(rmq.que(pos,i)!=y[i])continue;
				tree[1].upd(y[i], tree[1].que(y[i],n) + 1);
			}
		}
		cout<<max(tree[0].tree[1], tree[1].tree[1])<<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<=10){
		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,1,0)<<endl;
		return 0;
	}
	return 1;
	
	return 0;
}

Compilation message (stderr)

exam.cpp: In member function 'void rmqSegtree::build(int, int, int)':
exam.cpp:62:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   62 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In member function 'int rmqSegtree::que(int, int, int)':
exam.cpp:70:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   70 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In member function 'void ansSegtree::upd(int, int, int)':
exam.cpp:87:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   87 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In member function 'int ansSegtree::que(int, int, int)':
exam.cpp:96:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   96 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In function 'int main()':
exam.cpp:154:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  154 |  bool tc4 = v.size()==n;
      |             ~~~~~~~~^~~

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