Submission #761253

#	Time	Username	Problem	Language	Result	Execution time	Memory
761253		Dan4Life	Library (JOI18_library)	C++17	100 / 100	250 ms	592 KiB

library

#include <bits/stdc++.h>
#include "library.h"
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
int n;
vector<pair<int,int>> ed;
vector<int> ans, adj[1500];
 
void dfs(int s, int p){
	ans.pb(s);
	for(auto u : adj[s])
		if(u!=p) dfs(u,s); 
}
 
int chk(int l, int r, int q){
	int ans = 0;
	for(auto [a,b] : ed) ans+=a>=l and b<=r;
	return r-l+1-q-ans>0;
}
 
void Solve(int N)
{
	n = N; int tot = 0;
	vector<int> M(N,0);
	while(tot<n-1){
		int l = 1, r = n;
		while(l<r){
			int mid = (l+r)/2;
			fill(begin(M),begin(M)+mid,1);
			if(chk(1,mid,Query(M))) r=mid;
			else l=mid+1;
			fill(begin(M),begin(M)+mid,0);
		}
		int i = l;
		l = 1, r = i;
		while(l<r){
			int mid = (l+r+1)/2;
			fill(begin(M)+mid-1,begin(M)+i,1);
			if(chk(mid,i,Query(M))) l=mid;
			else r=mid-1;
			fill(begin(M)+mid-1,begin(M)+i,0);
		}
		adj[i].pb(l), adj[l].pb(i), ed.pb({l,i}); tot++;
	}
	for(int i = 1; i <= N; i++){
		if(sz(adj[i])<=1){
			dfs(i,-1), Answer(ans);
			return;
		}
	}
}

• Subtask 1: 19 / 19
• Subtask 2: 81 / 81