Submission #697823

#	Time	Username	Problem	Language	Result	Execution time	Memory
697823		vjudge1	Birthday gift (IZhO18_treearray)	C++17	0 / 100	4051 ms	11980 KiB

treearray

//#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
 
#define file ""
 
#define all(x) x.begin(), x.end()
 
#define fr first
#define sc second
 
#define pb push_back
                                                         
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pii;
const int N = 3e5;
const int inf = 1e9 + 5;

map <int, pii> mp;
int a[N], tin[N], tout[N], t[4 * N], timer = 1;
int up[N][25];
vector <int> g[N];


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

bool upper (int x, int y) {
	if (tin[x] <= tin[y] && tout[x] >= tout[y]) return true;
	return false;
}

int lca (int x, int y) {
	if (x == 0) return y;
	if (y == 0) return x;
	if (upper(x, y)) return x;
	if (upper(y, x)) return y;
	for (int i = 20; i >= 0; i--) {
		if (!upper(up[x][i], y)) x = up[x][i];
	}
	return up[x][0];
}

void build (int u, int l, int r) {
	if (l == r) {
		t[u] = a[l];
		return;
	}
	int m = l + r >> 1;
	build(u + u, l, m);
	build(u + u + 1, m + 1, r);
	t[u] = lca (t[u + u], t[u + u + 1]);
}

void upd (int u, int ul, int ur, int pos, int val) {
	if (ul == ur && ul == pos) {
		t[u] = val;
		return;
	}
	int m = ul + ur >> 1;
	if (pos <= m) upd(u + u, ul, m, pos, val);
	else upd(u + u + 1, m + 1, ur, pos, val);
	t[u] = lca (t[u + u], t[u + u + 1]);
}

int get (int u, int ul, int ur, int l, int r) {
	if (ul > r || ur < l) return 0;
	if (ul >= l && ur <= r) return t[u];
	int m = ul + ur >> 1;
	int x = get(u + u, ul, m, l, r);
	int y = get(u + u + 1, m + 1, ur, l, r);
	return lca(x, y);
}

pii get (int u, int ul, int ur, int l, int r, int val) {
	//cerr << u << " " << ul << " " << ur << " " << l << " " << r << " " << val << endl;
	if (ul == ur && !upper(val, t[u])) return {-1, -1};
	if (ul > r || ur < l) {
		//cerr << u << " " << ul << " " << ur <<  " " << val << " " << t[u] << " ok1\n";
		return {-1, -1};
	}
	if (ul >= l && ur <= r && upper(val, t[u])) {
		//cerr << u << " " << ul << " " << ur << " " << val << " " << t[u] << " ok2\n";
		return {ul, ur};
	}
	//if (ul >= l && ur <= r && !upper(val, t[u])) {
	//	cerr << u << " " << ul << " " << ur <<  " " << val << " " << t[u] << " ok3\n";
	//	return {-1, -1};
	//}
	int m = ul + ur >> 1;
	pii x = get(u + u, ul, m, l, r, val);
	pii y = get(u + u + 1, m + 1, ur, l, r, val);
	//cerr << u << " " << ul << " " << ur << ": " << x.fr << " " << x.sc << " - " << y.fr << " " << y.sc << endl;
	if (x.fr == -1 && y.fr != -1) return y;
	else if (y.fr == -1 && x.fr != -1) return x;
	return {x.fr, y.sc};
}


int main(){


	ios_base :: sync_with_stdio(false);
	cin.tie(NULL);
	srand(time(NULL));
	int n, m, q;
	cin >> n >> m >> q;
	int u, v, tp;
	for  (int i = 1; i < n; i++) {
		cin >> u >> v;
		g[u].pb(v);
		g[v].pb(u);
	}
	dfs(1, 1);
	for (int i = 1; i <= m; i++) {
		cin >> a[i];
	}
	build (1, 1, m);
	while (q--) {
		cin >> tp;
		if (tp == 1) {
			int pos, val;
			cin >> pos >> val;
			a[pos] = val;
			upd(1, 1, m, pos, val);
		} 
		else {
			int l, r, val;
			cin >> l >> r >> val;
			int ok = 0;
			for (int i = l; i <= r; i++) {
				cerr << "i: " << i << "\n";
				int R = r;
				while(R >= i) {
					cerr << R << " ";
					int M = i + R + 1 >> 1;
					int templca = get(1, 1, m, i, R);
					cerr << templca << endl;
					if (templca == val) {
						cout << i << " " << R << "\n";
						ok = 1;
						break;
					}
					if (upper(templca, val) && templca != val) R = M - 1;
					else {
						if (R == r) {
						break;
						} 
						R = M + 1;
					}
				}
				if (ok == 1) break;
			}
			if (ok == 0) cout << -1 << " " << -1 << "\n";
		}
	}
}

Compilation message (stderr)

treearray.cpp: In function 'void build(int, int, int)':
treearray.cpp:60:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   60 |  int m = l + r >> 1;
      |          ~~^~~
treearray.cpp: In function 'void upd(int, int, int, int, int)':
treearray.cpp:71:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |  int m = ul + ur >> 1;
      |          ~~~^~~~
treearray.cpp: In function 'int get(int, int, int, int, int)':
treearray.cpp:80:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   80 |  int m = ul + ur >> 1;
      |          ~~~^~~~
treearray.cpp: In function 'pii get(int, int, int, int, int, int)':
treearray.cpp:101:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  101 |  int m = ul + ur >> 1;
      |          ~~~^~~~
treearray.cpp: In function 'int main()':
treearray.cpp:147:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  147 |      int M = i + R + 1 >> 1;
      |              ~~~~~~^~~

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