oj.uz

Submission #1043688

# Submission time Handle Problem Language Result Execution time Memory
1043688 2024-08-04T13:50:59 Z beaconmc Spring cleaning (CEOI20_cleaning) C++14
28 / 100
 1000 ms 17352 KB 
#include <bits/stdc++.h>
 
typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)
 
using namespace std;

vector<ll> edges[200005];
ll realans = 0;
ll vals[200005];
ll origvals[200005];
ll par[200005];

int dp(ll a, ll p){

	par[a] = p;
	ll ans = 0;
	if (edges[a].size() <= 1) ans = 1;
	for (auto&i : edges[a]){
		if (i != p) ans += dp(i, a);
	}		
	if (p!=-1) realans += 1 + (ans+1)%2;

	if (p != -1) vals[a] = 1 + (ans+1)%2;

	origvals[a] = 1 + (ans+1)%2;

	return 1 + (ans+1)%2;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	ll n,q;
	cin >> n >> q;
	FOR(i,0,n-1){
		ll a,b;
		cin >> a >> b;
		edges[a].push_back(b);
		edges[b].push_back(a);
	}
	ll root = -1;
	ll cnt = 0;
	FOR(j,1,n+1){
		if (edges[j].size() != 1){
			root = j;
		}else{
			cnt++;
		}
	}
	dp(root, -1);
	ll ans = 0;
	FOR(i,1,n+1) ans += vals[i];
	

	FOR(i,0,q){
		ll d; cin >> d;
		ll cur = n+1;
		ll curans = 0;
		set<ll> used;
		ll newleaves=0;

		FOR(k,0,d){
			ll temp; cin >> temp;
			used.insert(temp);
			if (edges[temp].size() != 1){
				newleaves++;
				curans+= 1;
				ll idk = temp;
				while (idk != root){
					used.insert(idk);
					if (vals[idk]==1) curans += 1, vals[idk]=2;
					else curans -= 1, vals[idk] = 1;
					idk = par[idk];
				}
			}else{
				curans += 1;
			}
			edges[temp].push_back(cur++);
		}


		for (auto&k : used){
			vals[k] = origvals[k];
		}


		if ((cnt+newleaves)%2==1) cout << -1 << "\n";
		else{
			cout << ans+curans << "\n";
		}
		for (auto&i : used){
			while (edges[i].size() && edges[i][edges[i].size()-1]>n){
				edges[i].pop_back();
			}
		}

	}
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 9564 KB Output is correct
2 Correct 64 ms 11204 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 10840 KB Output is correct
2 Correct 12 ms 10844 KB Output is correct
3 Correct 15 ms 13836 KB Output is correct
4 Correct 35 ms 15888 KB Output is correct
5 Correct 39 ms 17352 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1052 ms 10624 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1063 ms 11356 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 12884 KB Output is correct
2 Correct 105 ms 13088 KB Output is correct
3 Correct 80 ms 11664 KB Output is correct
4 Correct 122 ms 13040 KB Output is correct
5 Correct 106 ms 12888 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 15116 KB Output is correct
2 Execution timed out 1020 ms 16216 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 9564 KB Output is correct
2 Correct 64 ms 11204 KB Output is correct
3 Correct 13 ms 10840 KB Output is correct
4 Correct 12 ms 10844 KB Output is correct
5 Correct 15 ms 13836 KB Output is correct
6 Correct 35 ms 15888 KB Output is correct
7 Correct 39 ms 17352 KB Output is correct
8 Execution timed out 1052 ms 10624 KB Time limit exceeded
9 Halted 0 ms 0 KB -