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Submission #566563

# Submission time Handle Problem Language Result Execution time Memory
566563 2022-05-22T12:11:48 Z lorenzoferrari Ancient Books (IOI17_books) C++17
0 / 100
 1 ms 340 KB 
#include <bits/stdc++.h>
#include "books.h"
using namespace std;
using LL = long long;

#ifdef LORENZO
const int N = 1000;
#else
const int N = 1e6 + 42;
#endif

int t[2*N];

void upd(int l, int r) {
  for (l += N, r += N; l < r; l >>= 1, r >>= 1) {
    if (l & 1) t[l++] = 1;
    if (r & 1) t[--r] = 1;
  }
}
int qry(int p) {
  int ans = 0;
  for (p += N; p > 0; p >>= 1) {
    ans = max(ans, t[p]);
  }
  return ans == 0;
}

LL minimum_walk(vector<int> p, int s) {
  int n = p.size();
  LL ans = 0;
  for (int i = 0; i < n; ++i) {
    ans += abs(i - p[i]);
  }
  if (ans == 0) return ans;
  int rl = s+1;
  int rr = s;
  vector<int> cyc(n, -1);
  for (int i = 0, c = 0; i < n; ++i) {
    if (cyc[i] != -1) continue;
    int ii = i, l = i, r = i;
    do {
      cyc[ii] = c;
      ii = p[ii];
      l = min(l, ii);
      r = max(r, ii);
    } while (i != ii);
    ++c;
    if (l != r) {
      upd(l+1, r+1);
      rl = min(rl, r+1);
      rr = max(rr, l);
    }
  }
  for (int i = rl; i <= rr; ++i) {
    ans += 2 * qry(i);
  }
  int first_step = 0;
  for (int d = 0;; ++d) {
    if (s-d >= 0 && p[s-d] != s-d) {
      first_step = d;
      break;
    } else if (s+d < n && p[s+d] != s+d) {
      first_step = d;
      break;
    }
  }
  ans += 2 * first_step;
  return ans;
}

Subtask #1
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB 3rd lines differ - on the 1st token, expected: '6', found: '8'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB 3rd lines differ - on the 1st token, expected: '6', found: '8'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB 3rd lines differ - on the 1st token, expected: '6', found: '8'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 340 KB 3rd lines differ - on the 1st token, expected: '3304', found: '2744'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB 3rd lines differ - on the 1st token, expected: '6', found: '8'
2 Halted 0 ms 0 KB -