Submission #139123

#	Time	Username	Problem	Language	Result	Execution time	Memory
139123		zoooma13	Ancient Books (IOI17_books)	C++14	0 / 100	2 ms	376 KiB

books

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

int n;

long long minimum_walk(std::vector<int> p, int s) {
    n = p.size();
    vector <int> sz(n) ,vis(n) ,rep(n);
    for(int i=0; i<n; i++) if(!vis[i]){
        int tot = 0;
        for(int j=i; !vis[j]; j=p[j]){
            tot += abs(p[j]-j);
            rep[j] = i;
            vis[j] = 1;
        }
        sz[i] = tot;
    }
    fill(vis.begin() ,vis.end() ,0);
    long long ans = 0LL ,lst = 0;
    for(int i=0; i<n; i++){
        if(!vis[rep[i]] && sz[rep[i]]){
            ans += sz[rep[i]]+(i-lst);
            vis[rep[i]] = 1;
            lst = rep[i];
        }
    }
    return ans+lst;
}

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