Submission #683768

#	Time	Username	Problem	Language	Result	Execution time	Memory
683768		MateGiorbelidze	Birthday gift (IZhO18_treearray)	C++14	0 / 100	1 ms	340 KiB

treearray

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ff first
#define sc second
#define pb push_back
#define in insert

vector <ll> g[2001], tin(2001) , tout(2001);

ll up[2001][13] , cur;

void dfs (ll v, ll p) {
	
	tin[v] = ++cur;
	
	for (int i = 1; i <= 12; i++)
		up[v][i] = up[up[v][i - 1]][i - 1];
	
	for (auto k : g[v]) {
		
		if (k == p) continue;
		
		up[k][0] = v;
		
		dfs(k , v);
		
	}
	
	tout[v] = ++cur;
	
}

bool is_par(ll a, ll b) {
	
	if (tin[a] <= tin[b] && tout[a] >= tout[b]) return 1;
	else return 0;
	
}

ll lca (ll a, ll b) {
	
	if (is_par(a , b)) return a;
	if (is_par(b , a)) return b;
	
	for (int i = 12; i >= 0; i--) {
		
		if (!is_par(up[a][i] , b)) a = up[a][i];
		
	}
	
	return up[a][0];
	
}

void dambo_12() {
	
	ll n , m , q; cin>>n>>m>>q;
	
	for (int i = 1; i < n; i++){
		ll a , b; cin>>a>>b;
		
		g[a].pb(b);
		g[b].pb(a);
	}
	
	up[1][0] = 1;
	
	dfs(1 , 1);
	
	vector <ll> a(m + 1 , 0);
	
	for (int i = 1; i <= m; i++)
		cin>>a[i];
		
	for (int it = 1; it <= q; it++) {
		
		int tp; cin>>tp;
		
		if (tp == 1) {
			
			int pos ; ll v; cin>>pos>>v;
			
			a[pos] = v;
			
		}
		else {
			
			int l , r , v; cin>>l>>r>>v;
			
			int x = -1 , y = -1 , check = a[l];
			
			for (int i = l + 1; i <= r; i++) {
				
				check = lca(check , a[i]);
				
			}
			
			if (!is_par(check , v)) {
				
				cout<<-1<<" "<<-1<<'\n'; break;
				
			}
			
			for (int i = l; i <= r; i++){
				
				int c = a[i];
				
				for (int j = i; j <= r; j++){
					
					c = lca(c , a[j]);
					
					if (c == v) {
						
						x = i; y = j; break;
						
					}
					
					if (!is_par(v , c)) break;
					
				}
				
				if (x != -1) break;
				
			}
			
			cout<<x<<" "<<y<<'\n';
			
		}
		
	}	
	
	return;
}


int32_t main () {
	ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    ll o = 1; //cin>>o;
    
    while (o--) {
    	
    	dambo_12();
    	
	}
	
	return 0;
    
}

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