Submission #36140

#	Time	Username	Problem	Language	Result	Execution time	Memory
36140		Dat160601	Money (IZhO17_money)	C++14	100 / 100	279 ms	9988 KiB

money

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
int n,a[1000007],bit[1000007];
int ans=1,cur=1;
void upd(int pos){
	for(int i=pos;i<=1000000;i+=i&-i){
		bit[i]++;
	}
}
long long get(int pos){
	long long res=0;
	for(int i=pos;i>=1;i-=i&-i){
		res+=bit[i];
	}
	return res;
}
int main(){
	ios_base::sync_with_stdio(0);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=2;i<=n;i++){
		int res=get(a[i]-1);
		res-=get(a[cur]);
		if(a[i]<a[i-1] || res>0){
			ans++;
			while(cur<i){
				upd(a[cur]);
				cur++;
			}
		}
	}
	cout<<ans;
}

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