Submission #500779

#	Time	Username	Problem	Language	Result	Execution time	Memory
500779		pragmatist	Birthday gift (IZhO18_treearray)	C++17	30 / 100	139 ms	17932 KiB

treearray

#include <bits/stdc++.h>                            
 
#define pb push_back
#define sz(v) (int)v.size()
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define x first
#define y second
#define int long long
#define nl "\n"
 
using namespace std;

typedef long long ll;
typedef pair<long long, long long> pll;
typedef pair <ll, ll> pii;

const int N = (int)2e5 + 7;
const int M = (int)7e6 + 7;
const ll MOD = (ll)1e9 + 7;                    
const int inf = (int)1e9 + 7;
const ll INF = (ll)3e18 + 7;

pii dir[] = {{-1, -1}, {1, 1}, {-1, 1}, {1, -1}};

int n, m, q, a[N], val[501][501];
int timer, tin[N], tout[N], up[N][19];
vector<int> g[N];

void calc(int v, int pr) {
	up[v][0] = pr;
	tin[v] = ++timer;
	for(int i = 1; i <= 18; ++i) {
		up[v][i] = up[up[v][i-1]][i-1];
	}
	for(auto to : g[v]) {
		if(to != pr) {
			calc(to, v);
		}
	}	
	tout[v] = ++timer;
}

bool is_parent(int u, int v) {
	return tin[u] <= tin[v] && tout[u] >= tout[v];
}

int lca(int u, int v) {
	if(is_parent(u, v)) return u;
	if(is_parent(v, u)) return v;
	for(int i = 18; i >= 0; --i) {
		if(!is_parent(up[u][i], v)) {
			u = up[u][i];
		}
	}
	return up[u][0];
}

void solve() { 
	cin >> n >> m >> q;
	for(int i = 1; i < n; ++i) {
		int u, v;
		cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
	}
	for(int i = 1; i <= m; ++i) cin >> a[i];
	calc(1, 1);
	for(int i = 1; i <= m; ++i) {
		int x = a[i];
		for(int j = i; j <= m; ++j) {
			x = lca(x, a[j]);
			val[i][j] = x;	
		}
	}
	while(q--) {
		char tp;
		cin >> tp;
		int l, r, v;
		if(tp == '1') {
			cin >> l >> r;
			a[l] = r;
			for(int i = 1; i <= m; ++i) {
				int x = a[i];
				for(int j = i; j <= m; ++j) {
					x = lca(x, a[j]);
					val[i][j] = x;	
				}
			}
		} else {
			cin >> l >> r >> v;
			int a = -1, b = -1;
			for(int i = l; i <= r && a == -1; ++i) {
				for(int j = i; j <= r; ++j) {
					if(val[i][j] == v) {
						a = i;
						b = j;
						break;
					} 
				}
			}
			cout << a << ' ' << b << nl;			
		}
	} 	
}

signed main() {                   
	ios_base::sync_with_stdio(NULL);
    cin.tie(0);
    cout.tie(0);
   	int test = 1;
	//cin >> test;
	for(int i = 1; i <= test; ++i) {
        //cout << "Case " << i << ": ";
        solve();
    }
    return 0;
}
/*
3
3 1
2 3
1 1
*/

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