Submission #1076235

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076235		mdn2002	Ancient Books (IOI17_books)	C++14	0 / 100	1 ms	600 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;
long long minimum_walk(std::vector<int> p, int s) {
    assert(s == 0);

    long long ans = 0, n = p.size(), stt = 0;
    set<int> st;
    map<int, int> mp;
    for (int i = 0; i < n; i ++) {
        if (p[i] != i) {
            stt = 1;
            if (mp[i] == 0) {
                st.insert(p[i]);
                mp[p[i]] ++;
            }
            else {
                mp[i] --;
                st.erase(i);
            }
        }
        ans += st.size() * 2;
        if (stt == 0) ans += 2;
    }
    if (stt == 0) ans = 0;
    return ans;
}
/*
4 0
3 2 1 0
*/

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