Submission #1128115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128115		Vietnow	Money (IZhO17_money)	C++20	0 / 100	0 ms	324 KiB

money

#include <bits/stdc++.h>
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define int long long
#define ff first
#define ss second
#define pb push_back
#define y1 zildjian
#define left radio
#define right head
 
using namespace std;
 
const int N = 1e6+10;
const int INF = 1e18;
const int mod = 1e9+7;
const int mod1 = 998244353;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n;
int a[N];
pair<int,int> b[N];
int cnt[N];

void solve(){
    cin>>n;
    for(int i = 1;i<=n;i++){
        cin>>a[i];
        b[i] = {a[i],i};
    }

    // 4
    // 2
    // 1 2 
    // 4
    // 2 

    // 4
    // 2
    // 1 2
    // 4

    sort(b+1,b+1+n);
    int ans = 1;
    int lst = 1;
    for(int i = 2;i<=n;i++){
        if(a[i]<a[i-1]){
            lst = i;
            ans++;
            continue;
        }
        int l = 0;
        int r = n+1;
        while(r>l+1){
            int m = (l+r)/2;
            if(b[m].ff >= a[lst]){
                r = m;
            }
            else{
                l = m;
            }
        }
        // cout<<a[i-1]<<' '<<b[r].ff<<' '<<b[r].ss<<' '<<a[i]<<'\n';
        if(b[r].ss < lst){
            lst = i;
            ans++;
        }
    }
    cout<<ans<<'\n';
}


signed main(){
    // freopen("bootfall.in","r",stdin); 
    // freopen("bootfall.out","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    // cout.tie(nullptr);
    int t = 1;
    // cin>>t;
    for(int i = 1;i<=t;i++){
        // cout<<"Case "<<i<<": ";
        solve();
    }
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55