Submission #1113037

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113037		SalihSahin	Ancient Books (IOI17_books)	C++14	0 / 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();
   int mxs = 0;
   bool cek = 0;
   vector<int> vis(n);
   vector<int> on(n), arka(n); 
   for(int i = 0; i < n; i++){
      if(vis[i] || p[i] == i) continue;
      if(!cek){
         cek = 1;
         mxs = i;
      }

      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-2; 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);
      }
   }

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

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

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

   for(int i = 0; i <= n; i++){
      if(mxval[i] == -1) continue;
      ans += (mxval[i] - mnval[i] + 1);
   }
   //ans += mxs * 2;
   return ans;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:9:8: warning: variable 'mxs' set but not used [-Wunused-but-set-variable]
    9 |    int mxs = 0;
      |        ^~~

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