Submission #1113042

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113042		SalihSahin	Ancient Books (IOI17_books)	C++14	12 / 100	1 ms	336 KiB

books

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

long long minimum_walk(vector<int> p, int s) {
   long long ans = 0;
   int n = p.size();
   vector<int> vis(n);
   vector<int> on(n+1), arka(n+1); 
   for(int i = 0; i < n; i++){
      if(vis[i] || p[i] == i) continue;

      int x = i;
      while(!vis[x]){
         vis[x] = 1;
         if(x < p[x]){
            on[x]++;
            on[p[x]]--;
         }
         else{
            arka[x]++;
            arka[p[x]]--;
         }
         x = p[x];
      }
   }
   for(int i = 1; i <= n; i++){
      on[i] += on[i-1];
   }
   for(int i = n-1; i >= 0; i--){
      arka[i] += arka[i+1];
   }

   vector<int> mnval(n+1, -1), mxval(n+1, -1);
   for(int i = 0; i <= n; i++){
      if(on[i] == 0) continue;
      if(mnval[on[i]] == -1){
         mnval[on[i]] = i;
      }
      else{
         mnval[on[i]] = min(mnval[on[i]], i);
      }

      if(mxval[on[i]] == -1){
         mxval[on[i]] = i;
      }
      else{
         mxval[on[i]] = max(mxval[on[i]], i);
      }
   }

   vector<int> mnval2(n+1, -1), mxval2(n+1, -1);
   for(int i = 0; i <= n; i++){
      if(arka[i] == 0) continue;
      if(mnval2[arka[i]] == -1){
         mnval2[arka[i]] = i;
      }
      else{
         mnval2[arka[i]] = min(mnval2[arka[i]], i);
      }

      if(mxval2[arka[i]] == -1){
         mxval2[arka[i]] = i;
      }
      else{
         mxval2[arka[i]] = max(mxval2[arka[i]], i);
      }
   }

   int ind = 0;
   for(int i = 1; i <= n; i++){
      if(mxval[i] == -1) break;
      ans += ((mxval[i] + 1) - ind);
      ind = mxval[i] + 1;
      ans += (ind - (mnval2[i]));
      ind = mnval2[i];
   }
   ans += ind;

   return ans;
}

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