Submission #1094369

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094369		Sunbae	September (APIO24_september)	C++17	0 / 100	3 ms	5980 KiB

september

#include <bits/stdc++.h>
#include "september.h"
using namespace std;
const int N = 1e5 + 5, M = 2e5 + 5;
vector<int> g[N];
int vis[N], tin[N], tout[N], T[N], mn[N], mx[N], bit[M], ti, MX, MN;
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++; T[tin[u]] = u;
	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(mx, mx+n, MX = INT_MIN); fill(mn, mn+n, MN = INT_MAX);
	for(int i = 0, cnt = 1; i<m; ++i){
		fill(vis, vis+n, 0);
		for(int u: S[i]){
			if(!vis[u]){
				for(int j = tin[u]; j<=tout[u]; ++j) vis[T[tin[u]]] = cnt;
				++cnt;
			}	
		}
		for(int i = 1; i<n; ++i){
			mx[i] = max(mx[i], vis[i]); 
			mn[i] = min(mn[i], vis[i]);
		}
	}
	fill(bit, bit+M, 0);
	for(int i = 1; i<n; ++i){
		int l = mn[i] * 2, r = mx[i] * 2;
		upd(l, +1); upd(r+1, -1);
		MN = min(MN, l); MX = max(MX, r);
	}
	int ans = 0;
	for(int i = MN; i<=MX; ++i) if(!qry(i-1) && qry(i)) ++ans;
	return ans;
} 

• 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