Submission #332391

#	Time	Username	Problem	Language	Result	Execution time	Memory
332391		Bill_00	Money (IZhO17_money)	C++14	0 / 100	1 ms	384 KiB

money

#include <bits/stdc++.h>
#define MOD 1000000007
typedef long long ll;
using namespace std;
int a[1000001],b[1000001],pre[1000001],nex[1000001],cnt[1000001];
int main() {
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);
	cout.tie(NULL);
	int n;
	cin >> n;
	for(int i=1;i<=n;i++){
		cin >> a[i];
		cnt[a[i]]++;
		b[i]=a[i];
	}
	sort(b+1,b+n+1);
	for(int i=2;i<=n;i++){
		if(b[i]!=b[i-1]){
			pre[b[i]]=b[i-1];
		}
	}
	for(int i=1;i<n;i++){
		if(b[i]!=b[i+1]){
			nex[b[i]]=b[i+1];
		}
	}
	int i=n,ans=0,d;
	for(;i>=1;i--){
		d=0;
		while(d==0 || pre[a[i+1]]==a[i] || a[i+1]==a[i]){
			if(i==0) break;
			d++;
			cnt[a[i]]--;
			if(cnt[a[i]]==0){
				pre[nex[a[i]]]=pre[a[i]];
				nex[pre[a[i]]]=nex[a[i]];
			}
			i--;
		}
		ans++;
	}
	cout << ans;

}

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