Submission #603233

#	Time	Username	Problem	Language	Result	Execution time	Memory
603233		Apiram	Group Photo (JOI21_ho_t3)	C++14	0 / 100	0 ms	212 KiB

Main

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

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int n;cin>>n;
	vector<int>arr(n);
	for (int i = 0;i<n;++i){
		cin>>arr[i];
	}
	auto merge = [&](int left,int mid,int right){
		int ans = 0;
		int i = left,j = mid + 1,k = 0;
		vector<int>temp(right - left + 1);
		while(i<=mid && j<=right){
			if (arr[i] <= arr[j] + 2){
				temp[k++] = arr[i++];
			}
			else{
				ans+= mid - i + 1;
				temp[k++] = arr[j++];
			}
		}
		while(i<=mid){
			temp[k++] = arr[i++];
		}
		while(j<=right){
			temp[k++] = arr[j++];
		}
		int p = left;
		while(left<=right){
			arr[left] = temp[left - p];
			left++;
		}
		return ans;
	};
	function<int(int left,int right)>merge_sort = [&](int left,int right){
		if (left>=right)return 0;
		int ans = 0;
		int mid = (left + right)>>1;
		ans+=merge_sort(left,mid);
		ans+=merge_sort(mid + 1,right);
		ans+=merge(left,mid,right);
		return ans;
	};
	cout<<merge_sort(0,n - 1)<<'\n';
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36