Submission #1129527

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129527		zhasyn	Birthday gift (IZhO18_treearray)	C++20	0 / 100	4 ms	4932 KiB

treearray

#include <bits/stdc++.h>
#define pb push_back
#define pf push_front
using namespace std;
#define F first
#define S second
typedef long long ll;
#define pii pair <int, int>
#define pll pair <ll, ll>
typedef long double ld;
const ll N = 2 * 1e5 + 100, M = 500 + 10, len = 315, inf = 1e18;
const ll mod = 998244353;
ll um(ll a, ll b){
	return (1LL * a * b) % mod;
}
ll subr(ll a, ll b){
	return ((1LL * a - b) % mod + mod) % mod;
}
ll bp(ll x, ll step){
	ll res = 1;
	while(step){
		if(step & 1) res = um(res, x);
		x = um(x, x);
		step /= 2;
	}
	return res;
}
ll inv(ll x){
	return bp(x, mod - 2);
}
int tin[N], tout[N], timer, a[N];
vector <int> q[N];
bool was;
int from, to;
void dfs(int v, int p = -1){
	tin[v] = ++timer;
	for(auto u : q[v]){
		if(u == p) continue;
		dfs(u, v);
	}
	tout[v] = timer;
}

void check(int mn, int mx, int x){
	if(mn == INT_MAX) return;
	//cout << mn << " "<< mx << endl;
	int l = -1, r = (int)q[x].size() - 1;
	while(r - l > 1){
		int mid = (r + l) / 2;
		if(tout[q[x][mid]] >= tin[mn]) r = mid;
		else l = mid;
	}
	if(tout[r] < tin[mx]){
		if(was == false){
			cout << from << " "<< to << endl;
			was=  true;
		}
	}
}
int main() {
	//ios_base::sync_with_stdio(false);
	//cin.tie(nullptr);
	//cout.tie(nullptr);
	int n, m, qr;
	cin >> n >> m >> qr;
	for(int i = 0, a, b; i < n - 1; i++){
		cin >> a >> b;
		q[a].pb(b);
		q[b].pb(a);
	}
	dfs(1);
	for(int i = 1; i <= m; i++){
		cin >> a[i];
	}
	for(int i = 0, code, l, r, x, pos; i < qr; i++){
		cin >> code;
		if(code == 1){
			cin >> pos >> x;
			a[pos] = x;
		} else{
			cin >> l >> r >> x;
			int mn = INT_MAX, mx = INT_MIN;
			was = false;
			from = l;
			for(int j = l; j <= r; j++){
				if(tin[x] <= tin[a[j]] && tout[a[j]] <= tout[x]){
					mn = min(mn, tin[a[j]]);
					mx = max(mx, tin[a[j]]);
				} else{
					to = j - 1;
					check(mn, mx, x);
					from = j;
					mn = INT_MAX;
					mx = INT_MIN;
				}
			}
			to = r;
			check(mn, mx, x);
			if(was == false) cout << "-1 -1\n";
		}
	}
  return 0;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44