Submission #227793

#	Time	Username	Problem	Language	Result	Execution time	Memory
227793		VEGAnn	Ancient Books (IOI17_books)	C++14	50 / 100	315 ms	23268 KiB

books

#include <bits/stdc++.h>
#include "books.h"
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long long ll;
vector<array<int, 2> > vc;
ll ans = 0;
int n;

long long minimum_walk(std::vector<int> p, int s) {
    vc.clear();

    n = sz(p);

    for (int i = 0; i < n; i++){
        ans += abs(p[i] - i);
        if (p[i] != i)
            vc.PB({min(p[i], i), max(p[i], i)});
    }

    if (sz(vc)) {
        sort(all(vc));
        int lst = 0;

        for (array<int, 2> cr : vc)
            if (cr[0] > lst){
                ans += 2 * (cr[0] - lst);
                lst = cr[1];
            } else lst = max(lst, cr[1]);
    }

	return ans;
}

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