Submission #718747

#	Time	Username	Problem	Language	Result	Execution time	Memory
718747		Jarif_Rahman	Ancient Books (IOI17_books)	C++17	0 / 100	3 ms	340 KiB

books

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

ll minimum_walk(vector<int> p, int s){
    int n = p.size();
    ll ans = 0;

    vector<int> C(n, -1), sz;
    int k = 0;
    for(int i = 0; i < n; i++){
        if(C[i] != -1) continue;
        int x = p[i];
        C[i] = k;
        sz.pb(1);
        ans+=abs(i-x);
        while(x != i){
            C[x] = k;
            sz.back()++;
            ans+=abs(p[x]-x);
            x = p[x];
        }
        k++;
    }

    vector<set<int>> sth(k);
    for(int i = 0; i < n; i++) sth[C[i]].insert(i);

    vector<ll> mn(k, 1e9);
    for(int i = 0; i < n; i++){
        if(C[i] == 0 || sz[C[i]] < 2) continue;
        for(int j = 0; j < k; j++){
            if(C[i] == j) continue;
            auto it = sth[j].upper_bound(i);
            if(it != sth[j].begin() && it != sth[j].end()) mn[C[i]] = min(mn[C[i]], ll(i-*prev(it)));
            else if(it != sth[j].begin()) mn[C[i]] = min(mn[C[i]], ll(i-*prev(it))*2);
        }
    }

    for(int i = 1; i < k; i++) if(sz[i] > 1) ans+=mn[i];
    return ans;
}

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