Submission #619939

#	Time	Username	Problem	Language	Result	Execution time	Memory
619939		1ne	Pairs (IOI07_pairs)	C++14	18 / 100	440 ms	524288 KiB

pairs

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

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int b,n,d,m;cin>>b>>n>>d>>m;
	if (b == 1){
		vector<int>arr(m + 1,0);
		for (int i = 0;i<n;++i){
			int a;cin>>a;
			arr[a]++;
		}
		for (int i = 1;i<=m;++i){
			arr[i]+=arr[i - 1];
		}
		long long ans = arr[d] * (arr[d] - 1)/2;
		for (int i = d + 1;i<=m;++i){
			//cout<<i<<" "<<(arr[i] - arr[i - 1])<<" "<<arr[i - 1] - arr[i - d - 1]<<'\n';
			long long pos = (arr[i] - arr[i - 1]) * (arr[i - 1] - arr[i - d - 1]);
			ans+=pos;
			ans+=(arr[i] - arr[i - 1]) * (arr[i] - arr[i - 1] - 1)/2;
		}
		cout<<ans<<'\n';
	}
	else if (b == 2){
		vector<vector<int>>brr(m + 1,vector<int>(m + 1,0));
		for (int i = 0;i<n;++i){
			int a,b;cin>>a>>b;
			brr[a][b]++;
		}
		vector<vector<int>>corner_sum(m + 1,vector<int>(m + 1,-1));
		function<int(int,int)>dfs = [&](int i,int j){
			if (i < 0 || j > m)return 0;
			if (corner_sum[i][j]!=-1)return corner_sum[i][j];
			corner_sum[i][j] = brr[i][j] + dfs(i - 1,j + 1);
			return corner_sum[i][j];
		};
		for (int i = 1;i<=m;++i){
			for (int j = 0;j<=m;++j){
				brr[i][j] +=brr[i - 1][j];
			}
		}
		for (int i = 0;i<=m;++i){
			for (int j = 0;j<=m;++j){
				dfs(i,j);
			}
		}
		long long ans = 0;
		for (int i = 1;i + d<=m;++i){
			for (int j = 0;j<=m;++j){
				ans+=(corner_sum[i + d][j] - ((i - 1>=0 && j + d + 1<=m)?corner_sum[i - 1][j + d + 1] : 0)) * (brr[i][j] - brr[i - 1][j]);
			}
		}
		cout<<ans<<'\n';
	}
	else{
		
	}
	return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 0 / 6
• Subtask 4: 0 / 6
• Subtask 5: 6 / 6
• Subtask 6: 0 / 7
• Subtask 7: 0 / 7
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10
• Subtask 12: 0 / 10
• Subtask 13: 0 / 10