Submission #888226

#	Time	Username	Problem	Language	Result	Execution time	Memory
888226		pcc	Money (IZhO17_money)	C++14	0 / 100	1 ms	6492 KiB

money

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


const int mxn = 1e6+10;
int n;
int arr[mxn],pos[mxn],bit[mxn];
bitset<mxn> done;
int sh = 0;
int ans = 0;

void modify(int p,int v){
	for(;p<mxn;p+=p&-p)bit[p] += v;
	return;
}
int getval(int p){
	int re = 0;
	for(;p>0;p-= p&-p)re += bit[p];
	return re;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i = 1;i<=n;i++){
		cin>>arr[i];
		pos[arr[i]] = i;
	}
	for(int i = 1;i<=n;i++)assert(pos[i]);
	for(int i = n;i>=1;i--){
		int p = pos[i];
		if(p == n||arr[p+1]-getval(arr[p+1]) != i+1)ans++;
		else{
			if(!done[p+1])done[p+1] = true,modify(arr[p+1],1);
			done[p] = true,modify(i,1);
		}
	}
	cout<<ans;
}

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