Submission #521897

#	Time	Username	Problem	Language	Result	Execution time	Memory
521897		Kalashnikov	Birthday gift (IZhO18_treearray)	C++17	56 / 100	4098 ms	38176 KiB

treearray

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 2e5+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 , P = 6547;

int a[N];
vector<int> g[N];
int tin[N] , tout[N] , timer;
int up[N][20];

void dfs(int v = 1, int p = 0) {
	up[v][0] = p;
	for(int i = 1; i < 20; i ++) {
		up[v][i] = up[up[v][i-1]][i-1];
	}
	tin[v] = ++timer;
	
	for(auto to: g[v]) {
		if(to != p) {
			dfs(to , v);
		}
	}
	tout[v] = ++timer;
}

bool upper(int a , int b) {
	return tin[a] <= tin[b] && tout[a] >= tout[b];
}

int lca(int a , int b) {
	if(upper(a , b)) return a;
	if(upper(b , a)) return b;
	
	for(int i = 19; i >= 0; i --) {
		if(up[a][i] && !upper(up[a][i] , b)) {
			a = up[a][i];
		}
	}
	
	return up[a][0];
}

void solve(int tc) {
	int n , m , q;
	cin >> n >> m >> q;
	for(int i = 1; i < n; i ++) {
		int a , b;
		cin >> a >> b;
		g[a].push_back(b);
		g[b].push_back(a);
	}
	dfs();
	for(int i = 1; i <= m; i ++) {
		cin >> a[i];
	}
	
	while(q --) {
		int t;
		cin >> t;
		if(t == 2) {
			int l , r , v;
			cin >> l >> r >> v;
			int fnd = 0;
			int p = a[l] , last = l;
			for(int i = l; i <= r; i ++) {
				if(!upper(v , a[i])) {
					p = a[i+1];
					last = i+1;
					continue;
				}
				p = lca(p , a[i]);
				if(p == v) {
					fnd = 1;
					cout << last << ' ' << i << '\n';
					break;
				}
			}
			if(!fnd) {
				cout << "-1 -1\n";
				continue;
			}
			
		}
		else {
			int pos , val;
			cin >> pos >> val;
			a[pos] = val;
		}
	}
}
/*
*/
main() {
    ios;
    int tt = 1 , tc = 0;
    // cin >> tt;
    while(tt --) {
        solve(++tc);
    }
    return 0;
}

Compilation message (stderr)

treearray.cpp:102:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  102 | main() {
      | ^~~~

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