Submission #648617

#	Time	Username	Problem	Language	Result	Execution time	Memory
648617		ghostwriter	Ball Machine (BOI13_ballmachine)	C++14	100 / 100	153 ms	23484 KiB

ballmachine

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#else
#define debug(...)
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const int N = 1e5 + 5;
int n, q, minn[N], h[N], s[N], tout[N], itout[N], p[N][17], timer = 0, root = 0, f[N], f1[N];
vi adj[N];
void dfs(int u) {
	minn[u] = u;
	EACH(v, adj[u]) {
		dfs(v);
		minn[u] = min(minn[u], minn[v]);
	}
}
bool cmp(int a, int b) { return minn[a] < minn[b]; }
void dfs1(int u) {
	FOR(j, 1, 16) ::p[u][j] = ::p[::p[u][j - 1]][j - 1];
	s[u] = 1;
	sort(all(adj[u]), cmp);
	EACH(v, adj[u]) {
		h[v] = h[u] + 1;
		p[v][0] = u;
		dfs1(v);
		s[u] += s[v];
	}
	tout[u] = ++timer;
}
int getn(int a, int h) {
	FOR(i, 0, 16)
		if (h & (1 << i))
			a = p[a][i];
	return a;
}
void upd(int pos, int v) { for (int i = pos; i <= n; i += (i & -i)) f[i] += v; }
int fempty() {
	int cur = 0, cnt = 0, ans = n + 1;
	FOS(i, 16, 0) {
		if (cur + (1 << i) > n) continue;
		if (cnt + f[cur + (1 << i)] < cur + (1 << i)) ans = min(ans, cur + (1 << i));
		else {
			cur |= 1 << i;
			cnt += f[cur];
		}
	}
	return ans;
}
void upd1(int pos, int v) { for (int i = pos; i <= n; i += (i & -i)) f1[i] += v; }
void upd1(int l, int r, int v) { upd1(l, v); upd1(r + 1, -v); }
int get1(int pos) { int rs = 0; for (int i = pos; i >= 1; i -= (i & -i)) rs += f1[i]; return rs; }
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> n >> q;
    FOR(i, 1, n) {
    	int p;
    	cin >> p;
    	if (p) adj[p].pb(i);
    	else root = i;
    }
    dfs(root);
    dfs1(root);
    FOR(i, 1, n) itout[tout[i]] = i;
    WHILE(q--) {
    	int t;
    	cin >> t;
    	if (t == 1) {
    		int k, last = 0;
    		cin >> k;
    		FOR(i, 1, k) {
    			int pos = itout[fempty()];
    			upd(tout[pos], 1);
    			upd1(tout[pos] - s[pos] + 1, tout[pos], 1);
    			last = pos;
    		}
    		cout << last << '\n';
    		continue;
    	}
    	int x;
    	cin >> x;
    	int h = get1(tout[x]);
    	cout << h - 1 << '\n';
    	int tnode = getn(x, h - 1);
    	upd(tout[tnode], -1);
    	upd1(tout[tnode] - s[tnode] + 1, tout[tnode], -1);
    }
    return 0;
}
/*
8 2
0
1
2
2
3
3
4
6
1 8
2 5
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message (stderr)

ballmachine.cpp: In function 'void dfs(int)':
ballmachine.cpp:36:31: warning: unnecessary parentheses in declaration of 'v' [-Wparentheses]
   36 | #define EACH(i, x) for (auto &(i) : (x))
      |                               ^
ballmachine.cpp:56:2: note: in expansion of macro 'EACH'
   56 |  EACH(v, adj[u]) {
      |  ^~~~
ballmachine.cpp: In function 'void dfs1(int)':
ballmachine.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
ballmachine.cpp:63:2: note: in expansion of macro 'FOR'
   63 |  FOR(j, 1, 16) ::p[u][j] = ::p[::p[u][j - 1]][j - 1];
      |  ^~~
ballmachine.cpp:36:31: warning: unnecessary parentheses in declaration of 'v' [-Wparentheses]
   36 | #define EACH(i, x) for (auto &(i) : (x))
      |                               ^
ballmachine.cpp:66:2: note: in expansion of macro 'EACH'
   66 |  EACH(v, adj[u]) {
      |  ^~~~
ballmachine.cpp: In function 'int getn(int, int)':
ballmachine.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
ballmachine.cpp:75:2: note: in expansion of macro 'FOR'
   75 |  FOR(i, 0, 16)
      |  ^~~
ballmachine.cpp: In function 'int fempty()':
ballmachine.cpp:33:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   33 | #define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
      |                               ^
ballmachine.cpp:83:2: note: in expansion of macro 'FOS'
   83 |  FOS(i, 16, 0) {
      |  ^~~
ballmachine.cpp: In function 'int main()':
ballmachine.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
ballmachine.cpp:101:5: note: in expansion of macro 'FOR'
  101 |     FOR(i, 1, n) {
      |     ^~~
ballmachine.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
ballmachine.cpp:109:5: note: in expansion of macro 'FOR'
  109 |     FOR(i, 1, n) itout[tout[i]] = i;
      |     ^~~
ballmachine.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
ballmachine.cpp:116:7: note: in expansion of macro 'FOR'
  116 |       FOR(i, 1, k) {
      |       ^~~

• Subtask 1: 25 / 25
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40
• Subtask 4: 5 / 5