Submission #1094363

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094363		Sunbae	September (APIO24_september)	C++17	0 / 100	2 ms	5468 KiB

september

#include <cstdio>
#include <algorithm>
#include <vector>
#include "september.h"
using namespace std;
const int N = 1e5 + 5, M = 2e5 + 20;
vector<int> g[N];
int bit[M], tin[N], tout[N], T[N], mn[N], mx[N], ti;
void upd(int i, int v){ for(; i<M; i+=i&-i) bit[i] += v;}
int qry(int i){ int r = 0; for(; i; i-=i&-i) r += bit[i]; return r;}
void dfs(int u){
	tin[u] = ti++;
	for(int v: g[u]) dfs(v);
	tout[u] = ti-1;
}
int solve(int n, int m, vector<int> up, vector<vector<int>> S){
	for(int i = 0; i<n; ++i) g[i].clear();
	for(int i = ti = 1; i<n; ++i) g[up[i]].push_back(i);
	dfs(0);
	fill(mn, mn+n, n+1); fill(mx, mx+n, 0);
	for(int i = 0; i<n; ++i) T[tin[i]] = i;
	for(int i = 0, cnt; i<m; ++i){
		fill(bit, bit+n+1, cnt = 0);
		for(int u: S[i]){
			if(!qry(tin[u])){
				++cnt;
				upd(tin[u], +1); upd(tout[u]+1, -1);
				for(int j = tin[u]; j<=tout[u]; ++j){
					mn[T[j]] = min(mn[T[j]], cnt);
					mx[T[j]] = max(mx[T[j]], cnt);
				} 
			}
		}
	}
	fill(bit, bit+(n<<1)+20, 0);
	int MN = (n<<1) + 20, MX = 0;
	for(int i = 1; i<n; ++i){
		int l = (mn[i]<<1), r = (mx[i]<<1);
		upd(l, +1); upd(r+1, -1);
		MN = min(MN, l); MX = max(MX, r);
	}
	int cnt = 0;
	for(int i = MN; i<=MX; ++i) if(qry(i) && !qry(i-1)) ++cnt;
	return cnt;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 5
• Subtask 4: 0 / 9
• Subtask 5: 0 / 5
• Subtask 6: 0 / 11
• Subtask 7: 0 / 9
• Subtask 8: 0 / 11
• Subtask 9: 0 / 9
• Subtask 10: 0 / 16