Submission #583210

#	Time	Username	Problem	Language	Result	Execution time	Memory
583210		Mr_Husanboy	Global Warming (CEOI18_glo)	C++14	62 / 100	48 ms	15476 KiB

glo

// Muallif: Mansuraliyev Husanboy Murotali o'g'li  >> NamPS
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
 
using namespace std;
 
#define ll long long
#define ull unsigned long long 
#define ios ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define all(a) a.begin(), a.end()
#define F first
#define S second
#define fp(a,i,c) for(int (a) = (i); (a) < (c); (a)++)
#define fm(a,i,c) for(int (a) = (i); (a) >= (c); (a)--)
#define vii vector<int>
#define vll vector<ll>
// 0-9 >> 48-57;    A-Z>>65-90   and   a-z>>97-122 respectively;
 
int BS(std::vector<int>& v, int l, int r, int key)
{
    while (r - l > 1) {
        int m = l + (r - l) / 2;
        if (v[m] >= key)
            r = m;
        else
            l = m;
    }
    return r;
}
 
 
void solve(){
	ll n; cin>>n;
	//t.resize(4*n); 
	vll a;a.resize(n);
	ll x; cin>>x;
	for(ll i=0;i<n;i++) cin>>a[i];
//	set<ll> st;
	vector<int> last(n,0);
	int length=1;
	vector<pair<ll,ll>> l(n),r(n); 
	last[0]=a[0]; l[0]={1,a[0]};
	for(int i=1;i<n;i++){
		if(a[i]<last[0]){
			last[0]=a[i];
		}else if(a[i]>last[length-1]){
			last[length++]=a[i];
		}else{
			last[BS(last,-1,length-1,a[i])]=a[i];
		}
		l[i]={length,last[length-1]-x};
	}
	last.assign(n,0); last[0]=-a[n-1]; length=1;
	r[n-1]={1,a[n-1]};
	for(ll i=n-2;i>=0;i--){
		if(-a[i]<last[0]){
			last[0]=-a[i];
		}else if(-a[i]>last[length-1]){
			last[length++]=-a[i];
		}else last[BS(last,-1,length-1,-a[i])]=-a[i];
		r[i]={length,-last[length-1]};
	}
//	for(auto u:r) cout<<u.F<<' '<<u.S<<endl;
	vector<ll> close(n);
	r.push_back({0,1e10});
	stack<ll> s; s.push(n);
	for(ll i=n-1;i>=0;i--){
		while(r[s.top()].S<=l[i].S) s.pop();
		//cout<<l[i].S<<" "<<r[s.top()].S<<"\n";
		close[i]=s.top();
		s.push(i);
	}
	ll ans=0;
	for(ll i=0;i<n;i++){
		ans=max(ans,l[i].F+r[close[i]].F);
	}
	cout<<ans;
}
 
int main(){
	ios;
//	int t; cin>>t; while(t--)
	solve();
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25