Submission #1067422

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067422		vjudge1	Money (IZhO17_money)	C++17	100 / 100	679 ms	58960 KiB

money

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
const int maxN=1e6+5;
const ll inf=2e18;
int n,a[maxN+1],pre[maxN+1];
set<ll> se;
int main()
{
    //freopen("","r",stdin);
    //freopen("","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        pre[i]=-1;
    }
    int pos=-1;
    se.insert(inf);
    se.insert(a[1]);
    for(int i=2;i<=n;i++)
    {
        if(a[i]<a[i-1])
        {
            pos=i;
            break;
        }
        else se.insert(a[i]);
    }
    int cnt=1;
    if(pos==-1)
    {
        cout<<cnt;
        return 0;
    }
    cnt++;
    auto itr=se.upper_bound(a[pos]);
    int i=pos+1;
    ll base=(*itr);
    se.insert(a[pos]);
    while(i<=n)
    {
        while(i<=n&&a[i]>=a[i-1]&&(*se.lower_bound(a[i]))<=base)
        {
            se.insert(a[i]);
            i++;
        }
        //cout<<i<<" "<<cnt<<" "<<base<<'\n';
        if(i<=n)
        {
            cnt++;
            base=(*se.upper_bound(a[i]));
            se.insert(a[i]);
            //cout<<i<<" "<<(*se.upper_bound(a[i]))<<'\n';
            i++;
        }
    }
    cout<<cnt;
}
/*20
324662 468027 324662 324662 468027 324662 468027 324662 324662 468027 963343 944165 165047 127072 405908 918630 854332 571550 909067 448963*/

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55