Submission #1052319

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052319		0npata	Ancient Books (IOI17_books)	C++17	50 / 100	101 ms	8192 KiB

books

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

#define int long long
#define vec vector

long long minimum_walk(std::vector<int32_t> P, int32_t S) {
	int ans = 0;
	int N = P.size();
	for(int i = 0; i<N; i++) {
		ans += abs(P[i]-i);
	}
	int r = P[0];
	for(int i = 1; i<N; i++) {
		if(r < i) ans += 2;
		r = max((int) P[i], r);
	}

	for(int i = 0; i<S; i++) {
		if(P[i] != i) break;
		ans -= 2;
	}
	for(int i = N-1; i>S; i--) {
		if(P[i] != i) break;
		ans -= 2;
	}

	return ans;
}

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