Submission #642277

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
642277	2022-09-19T07:13:51 Z	dozer	Joker (BOI20_joker)	C++14	0 / 100	83 ms	9692 KB

Joker

#include <bits/stdc++.h>
using namespace std;
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define sp " "
#define endl "\n"
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define N 200005

const int modulo = 1e9 + 7;
int root[N], ans[N], u[N], v[N], l[N], r[N];

int find(int node)
{
	if (node < 0) return -(find(-node));
	if (node == root[node]) return node;
	return root[node] = find(root[node]);
}


int32_t main()
{
	
	fastio();


	int n, m, q;
	cin>>n>>m>>q;
	for (int i = 1; i <= n; i++)
		root[i] = i;

	for (int i = 1; i <= m; i++)
	{
		cin>>u[i]>>v[i];
	}

	for (int i = m; i >= 1; i--)
	{
		if (ans[i + 1] == 1) 
		{
			ans[i] = 1;
			continue;
		}
		int a = find(u[i]), b = find(v[i]);
		if (a == b) ans[i] = 1;
		else if (a != -b) root[a] = -b;
	}

	for (int i = 1; i <= q; i++)
	{
		cin>>l[i]>>r[i];
		if (ans[r[i] + 1] == 1) cout<<"YES\n";
		else cout<<"NO\n";
	}
	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}

Subtask #1
0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Incorrect	1 ms	328 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #2
0 / 8.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Incorrect	1 ms	328 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #3
0 / 25.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Correct	65 ms	9276 KB	Output is correct
4	Correct	64 ms	9096 KB	Output is correct
5	Incorrect	83 ms	9692 KB	Output isn't correct
6	Halted	0 ms	0 KB	-