Submission #299036

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
299036	2020-09-14 12:35:17	keko37	Ancient Books (IOI17_books)	C++14	50 / 100	264 ms	36472 KiB

books

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#include<bits/stdc++.h>
#include "books.h"
using namespace std;
typedef long long llint;
typedef vector <int> vi;
typedef pair <int, int> pi;
const int MAXN = 1000005;
llint n, s, sol, cnt;
int curr_lef, curr_rig, lim_lef, lim_rig, edge_lef = -1, edge_rig = -1;
int p[MAXN], ok_pref[MAXN], ok_suf[MAXN];
int bio[MAXN], lo[MAXN], hi[MAXN];
void precompute_ok () {
  for (int i = 0; i < n; i++) {
    if (i > 0) ok_pref[i] |= ok_pref[i - 1];
    if (i != p[i]) ok_pref[i] = 1;
    if (ok_pref[i] == 1 && edge_lef == -1) edge_lef = i;
  }
  for (int i = n-1; i >= 0; i--) {
    if (i + 1 < n) ok_suf[i] |= ok_suf[i + 1];
    if (i != p[i]) ok_suf[i] = 1;
    if (ok_suf[i] == 1 && edge_rig == -1) edge_rig = i;
  }
  while (ok_pref[s] == 0) s++, sol += 2;
  while (ok_suf[s] == 0) s--, sol += 2; 
}
 
 
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• Subtask 1: 12 / 12
• Subtask 2: 10 / 10
• Subtask 3: 28 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30