Submission #1109141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109141		Muhammet	Birthday gift (IZhO18_treearray)	C++17	56 / 100	4067 ms	48968 KiB

treearray

#include <bits/stdc++.h>

using namespace std;

vector <vector <int>> v, sp;

vector <int> h, p;

void dfs(int x, int y){
	h[x] = h[y]+1;
	p[x] = y;
	for(auto i : v[x]){
		if(i != y){
			dfs(i,x);
		}
	}
}

int lca(int x, int y){
	if(h[x] < h[y]) swap(x,y);
	for(int i = 20; i >= 0; i--){
		if(h[sp[x][i]] >= h[y]){
			x = sp[x][i];
		}
	}
	for(int i = 20; i >= 0; i--){
		if(sp[x][i] != sp[y][i]){
			x = sp[x][i];
			y = sp[y][i];
		}
	}
	if(x == y) return x;
	return p[x];
}

int main(){
	int n, m, q;
	cin >> n >> m >> q;
	v.resize(n+1);
	h.resize(n+1,0);
	for(int i = 1; i < n; i++){
		int u1, u2;
		cin >> u1 >> u2;
		v[u1].push_back(u2);
		v[u2].push_back(u1);
	}
	p.resize(n+1);
	sp.resize(n+1, vector <int> (25,0));
	dfs(1,0);
	for(int i = 1; i <= n; i++){
		sp[i][0] = p[i];
	}
	for(int j = 1; j <= 20; j++){
		for(int i = 1; i <= n; i++){
			sp[i][j] = sp[sp[i][j-1]][j-1];
		}
	}
	vector <int> a(m+1);
	for(int i = 1; i <= m; i++){
		cin >> a[i];
	}
	for(int i = 1; i <= q; i++){
		int t;
		cin >> t;
		if(t == 1){
			int in, vl;
			cin >> in >> vl;
			a[in] = vl;
		}
		else {
			int l, r, vl;
			cin >> l >> r >> vl;
			bool tr = 0;
			for(int j = l; j < r; j++){
				if(a[j] == vl){
					cout << j << ' ' << j << "\n";
					tr = 1;
					break;
				}
				if(lca(a[j],a[j+1]) == vl){
					tr = 1;
					cout << j << ' ' << j+1 << '\n';
					break;
				}
			}
			if(tr == 0){
				if(a[r] == vl){
					cout << r << ' ' << r << '\n';
				}
				else {
					cout << "-1 -1\n";
				}
			}
		}
	}
}

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