Submission #70355

#	Time	Username	Problem	Language	Result	Execution time	Memory
70355		gnoor	고대 책들 (IOI17_books)	C++17	0 / 100	2 ms	596 KiB

books

#include "books.h"

#include <vector>
#include <algorithm>
#include <cmath>
#include <cassert>

using namespace std;

bool visit[1000100];

long long minimum_walk(vector<int> p, int s) {
	int n=(int)p.size();
	vector<pair<int,int>> coord;
	long long ans=0;
	for (int i=0;i<n;i++) {
		if (visit[i]) continue;
		visit[i]=true;
		int mn=i;
		int mx=i;
		int cur=p[i];
		ans+=abs(p[i]-i);
		while (cur!=i) {
			visit[cur]=true;
			mx=max(mx,cur);
			mn=min(mn,cur);
			ans+=abs(p[cur]-cur);
			cur=p[cur];
		}
		coord.push_back({mn,mx});
	}
	sort(coord.begin(),coord.end(),[](const pair<int,int> &a,const pair<int,int> &b) {
			if (a.second!=b.second) return a.second<b.second;
			return a.first<b.first;
			});
	vector<pair<int,int>> re;
	for (int i=0;i<(int)coord.size();i++) {
		int curl=coord[i].first;
		//if (!re.empty()&&coord[i].second==re.back().second) continue;
		while (!re.empty()&&coord[i].first<=re.back().second) {
			curl=min(curl,re.back().first);
			re.pop_back();
		}
		re.push_back({curl,coord[i].second});
	}
	for (int i=1;i<(int)re.size();i++) {
		assert(re[i].first>=re[i-1].second);
		ans+=(re[i].first-re[i-1].second)*2;
	}
	return ans;
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30