Submission #113560

#	Time	Username	Problem	Language	Result	Execution time	Memory
113560		E869120	Ancient Books (IOI17_books)	C++14	50 / 100	160 ms	18996 KiB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;

int n, cnt[1000009];

long long minimum_walk(vector<int> p, int s) {
	n = p.size(); int maxn = 0;
	for (int i = 0; i < n; i++) {
		int u = i, v = p[i]; if (u > v) swap(u, v); if (u != v) { maxn = max(maxn, max(u, v)); }
		cnt[u]++; cnt[v]--;
	}
	for (int i = 1; i <= n; i++) cnt[i] += cnt[i - 1];
	
	long long sum = 0; for (int i = 0; i < n; i++) sum += 1LL * abs(p[i] - i);
	for (int i = 0; i < maxn; i++) { if (cnt[i] == 0) sum += 2; }
	return sum;
}

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