Submission #552214

#	Time	Username	Problem	Language	Result	Execution time	Memory
552214		Arnch	Synchronization (JOI13_synchronization)	C++17	100 / 100	3497 ms	81440 KiB

synchronization

// oooo
/*
 har chi delet mikhad bebar ~
 gitar o ba khodet nabar! ~
 ;Amoo_Hasan;
*/

#include<bits/stdc++.h>
//#pragma GCC optimize("O3,no-stack-protector,unroll-loops")
//#pragma GCC target("avx2,fma")
#pragma GCC optimzie("Ofast")

using namespace std;

typedef long long ll;
typedef long double ld;

#define Sz(x) int((x).size())
#define All(x) (x).begin(), (x).end()
#define wtf(x) cout<<#x <<" : " <<x <<endlefii
#define endl '\n'

constexpr ll inf = 1e18, N = 1e6 + 10, mod = 1e9 + 7, Log = 30;

struct node {
	int cnt, lz;
	node() {
		cnt = lz = 0;
	}
} x[N << 2];
int u[N], v[N], h[N], st[N], fn[N], par[N][Log], tim, n, m, q;
ll last[N], sum[N];
bool vis[N];
vector<int> vc, G[N];

void dfs(int x, int p = 0) {
	par[x][0] = p;
	for(int i = 1; i < Log; i++) par[x][i] = par[par[x][i - 1]][i - 1];

	h[x] = h[p] + 1;
	st[x] = tim++;
	for(auto &i : G[x]) {
		if(i == p) continue;
		dfs(i, x);
	}
	fn[x] = tim;
}

void put(int l, int r, int v) {
	if(x[v].lz == 0) return;
	x[2 * v].cnt += x[v].lz, x[2 * v].lz += x[v].lz;
	x[2 * v + 1].cnt += x[v].lz, x[2 * v + 1].lz += x[v].lz;
	x[v].lz = 0;
}

void change(int l, int r, int s, int e, int val, int v) {
	if(r <= s || l >= e) return;
	if(l >= s && r <= e) {
		x[v].cnt += val;
		x[v].lz += val;
		return;
	}
	put(l, r, v);
	int mid = (l + r) >> 1;
	change(l, mid, s, e, val, 2 * v), change(mid, r, s, e, val, 2 * v + 1);
}

int get(int l, int r, int ind, int v) {
	if(r - l < 2) return x[v].cnt;
	put(l, r, v);
	int mid = (l + r) >> 1;
	if(ind < mid) return get(l, mid, ind, 2 * v);
	return get(mid, r, ind, 2 * v + 1);
}

int get_par(int x) {
	for(int i = Log - 1; i >= 0; i--) {
		int val = get(0, n, st[par[x][i]], 1);
		int val2 = get(0, n, st[x], 1);
		if(val2 == val + (h[x] - h[par[x][i]])) x = par[x][i];
	}
	return x;
}


int main() {
    ios :: sync_with_stdio(0), cin.tie(0);

	cin >>n >>m >>q;
	for(int i = 1; i <= n - 1; i++) {
		cin >>u[i] >>v[i];
		G[u[i]].push_back(v[i]), G[v[i]].push_back(u[i]);
	}

	dfs(1);	

	for(int i = 1; i <= n - 1; i++) {
		if(h[u[i]] > h[v[i]]) swap(u[i], v[i]);
	}

	for(int i = 1; i <= n; i++) sum[i] = 1;

	while(m--) {
		int ind; cin >>ind;
		int ui = u[ind], vi = v[ind];
		int pu = get_par(ui), pv = get_par(vi);
		if(!vis[ind]) {
			vis[ind] = 1;
			int bac = sum[pu] + sum[pv] - last[ind];
			change(0, n, st[vi], fn[vi], 1, 1);
			pu = get_par(ui);
			sum[pu] = bac;
		}
		else {
			vis[ind] = 0;
			last[ind] = sum[pu];
			change(0, n, st[vi], fn[vi], -1, 1);
			pu = get_par(ui), pv = get_par(vi);
			sum[pu] = last[ind], sum[pv] = last[ind];
		}
	}

	while(q--) {
		int ind; cin >>ind;
		int p = get_par(ind);
		cout<<sum[p] <<endl;
	}

    return 0;
}

Compilation message (stderr)

synchronization.cpp:11: warning: ignoring '#pragma GCC optimzie' [-Wunknown-pragmas]
   11 | #pragma GCC optimzie("Ofast")
      |

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 40 / 40