oj.uz

Submission #1015316

# Submission time Handle Problem Language Result Execution time Memory
1015316 2024-07-06T08:40:30 Z 우민규(#10889) Sorting (IOI15_sorting) C++14
0 / 100
 1 ms 532 KB 
#include "sorting.h"

#include <bits/stdc++.h>
using namespace std;

// can swap -> (valid swapping)
// can't -> {}
vector<pair<int, int>> can_sort(vector<int> perm, int m, int* x, int* y) {
  for (int i = 0; i < m; ++i) swap(perm[x[i]], perm[y[i]]);
  // sort perm
  vector<pair<int, int>> sorting;
  for (int i = 0; i < perm.size(); ++i) {
    while (perm[i] != i) {
      swap(perm[i], perm[perm[i]]);
      sorting.push_back({i, perm[i]});
    }
  }
  if (sorting.size() > m) {
    return {};
  }
  while (sorting.size() < m) sorting.push_back({0, 0});
  vector<int> swap_perm(perm.size());
  iota(swap_perm.begin(), swap_perm.end(), 0);
  for (int i = m - 1; i >= 0; --i) {
    swap(swap_perm[x[i]], swap_perm[y[i]]);
  }
  for (int i = 0; i < m; ++i) {
    swap(swap_perm[x[i]], swap_perm[y[i]]);
    sorting[i].first = swap_perm[sorting[i].first];
    sorting[i].second = swap_perm[sorting[i].second];
  }
  return sorting;
}

int findSwapPairs(int n, int s[], int m, int x[], int y[], int p[], int q[]) {
  bool is_zero = true;
  for (int i = 0; i < n; ++i)
    if (s[i] != i) is_zero = false;
  if (is_zero) return 0;
  // rl(0) -> not possible
  // rh(m) -> possible
  int rl = 0, rh = m;
  vector<pair<int, int>> pos_sorting = can_sort(vector<int>(s, s + n), m, x, y);
  while (rl + 1 < rh) {
    int rm = (rl + rh) / 2;
    vector<pair<int, int>> sorting = can_sort(vector<int>(s, s + n), rm, x, y);
    // not possible
    if (sorting.size() == 0) {
      rl = rm;
    } else {
      rh = rm;
      pos_sorting = sorting;
    }
  }
  for (int i = 0; i < rh; ++i) {
    p[i] = pos_sorting[i].first;
    q[i] = pos_sorting[i].second;
  }
  return rh;
}

#ifndef EVAL
#include "grader.cpp"
#endif

Compilation message

sorting.cpp: In function 'std::vector<std::pair<int, int> > can_sort(std::vector<int>, int, int*, int*)':
sorting.cpp:12:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |   for (int i = 0; i < perm.size(); ++i) {
      |                   ~~^~~~~~~~~~~~~
sorting.cpp:18:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |   if (sorting.size() > m) {
      |       ~~~~~~~~~~~~~~~^~~
sorting.cpp:21:25: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |   while (sorting.size() < m) sorting.push_back({0, 0});
      |          ~~~~~~~~~~~~~~~^~~

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 532 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 532 KB Output isn't correct
2 Halted 0 ms 0 KB -