Submission #977361

#	Time	Username	Problem	Language	Result	Execution time	Memory
977361		mariaclara	Ancient Books (IOI17_books)	C++17	50 / 100	97 ms	19896 KiB

books

#include "books.h"
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second

ll minimum_walk(vector<int> p, int s) {
	int n = sz(p);
	vector<bool> vis(n);
	vector<pii> aux, range;

	ll ans = 0;
	for(int i = 0; i < n; i++) {
		int x = i, m = i;
		while(!vis[x]) {
			vis[x] = 1;
			x = p[x];
			m = max(m, x);
		}

		ans += abs(p[i]-i);
		if(i != m) aux.pb({i,m});
	}

	for(int i = 0; i < sz(aux);) {
		int l = aux[i].fr, r = aux[i].sc, j = i;
		while(j < sz(aux) and aux[j].fr < r) {
			r = max(r, aux[j].sc);
			j++;
		}
		i=j;
		range.pb({l,r});
	}

	for(int i = 0; i < sz(range); i++) {
		if(i == 0) ans += 2*range[i].fr;
		else ans += 2*(range[i].fr - range[i-1].sc);
	}

	return ans;
}

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