Submission #835501

#	Time	Username	Problem	Language	Result	Execution time	Memory
835501		vjudge1	Exam (eJOI20_exam)	C++14	100 / 100	106 ms	10940 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;
vector<int> v;

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

struct Segtree{
	int tree[1<<18];
	int n,val,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);
	}
	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;
	}
	void upd(int pos,int _v){
		a = pos;
		val = _v;
		upd(1,1,n);
	}
}rmq, tree;

vector<int> z[MAX];

int main(){
//	freopen("input.4_j", "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;
	}
	
	rmq.n = tree.n = n;
	rmq.build(1,1,n);
	rep(i,1,n)z[x[i]].pb(i);
	int pos,val;
	rep(i,1,n){
		if(x[i]<=y[i]){
			it = lower_bound(all(z[y[i]]), i);
			pos = -1;
			if(it != z[y[i]].end()){
				pos = *it;
				if(rmq.que(i,pos)==y[i])tree.upd(pos, tree.que(1,pos) + 1);
			}
			if(pos != i && it != z[y[i]].begin()){
				pos = *prev(it);
				if(rmq.que(pos, i)==y[i])tree.upd(pos, tree.que(1, pos) + 1);
			}
		}
	}
	cout<<tree.tree[1]<<endl;
	return 0;
}

Compilation message (stderr)

exam.cpp: In member function 'void Segtree::build(int, int, int)':
exam.cpp:37:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   37 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In member function 'int Segtree::que(int, int, int)':
exam.cpp:45:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   45 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In member function 'void Segtree::upd(int, int, int)':
exam.cpp:57:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   57 |   int mid = le+ri>>1;
      |             ~~^~~
exam.cpp: In function 'int main()':
exam.cpp:90:10: warning: unused variable 'val' [-Wunused-variable]
   90 |  int pos,val;
      |          ^~~

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