Submission #987884

#	Time	Username	Problem	Language	Result	Execution time	Memory
987884		kachim2	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	5 ms	5260 KiB

shoes

#include "shoes.h"
#include <climits>
#include <vector>
#include <iostream>
long long count_swaps(std::vector<int> s) {
  std::vector<int> pos(s.size(), INT_MIN);
  std::vector<int> spos(s.size());
  std::vector<int> rpos(s.size());
  for (int i = 0; i < s.size(); i++) {
    spos[i] = i;
  }
  for (int i = 0; i < s.size(); i++) {
    rpos[i] = i;
  }
  std::vector<int> qm[100007];
  std::vector<int> qp[100007];
  for (int i = 0; i < s.size(); i++) {
    if (s[i] < 0) {
      if (qp[-s[i]].empty()) {
	qm[-s[i]].push_back(i);
      } else {
        auto x = *qp[-s[i]].rbegin();
        qp[-s[i]].pop_back();
	pos[i] = x;
      }
    } else {
      if (qm[s[i]].empty()) {
	qp[s[i]].push_back(i);
      } else {
        auto x = *qm[s[i]].rbegin();
        qm[s[i]].pop_back();
	pos[i] = x;
      }
    }
  }
  long count = 0;
  for (int i = 0; i < s.size(); i++) {
    if (pos[i] >= 0) {

      int wp = s[spos[i]] > 0 ? spos[pos[i]] + 1 : spos[pos[i]];
      count+=spos[i]-wp;
      for (int j = wp; j < spos[i]; j++) {
        spos[rpos[j]]++;
	rpos[spos[j]] = j;
      }
      spos[i] = wp;
      rpos[wp] = i;
    } 
  }
  /*  for (auto i : spos) {
    std::cerr << i << ' ';
  }
  std::cerr << '\n';
  for (auto i : rpos) {
    std::cerr << i << ' ';
  }
  std::cerr << '\n';
  for (auto i : pos) {
    std::cerr << i << ' ';
    }*/
  return count;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:9:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |   for (int i = 0; i < s.size(); i++) {
      |                   ~~^~~~~~~~~~
shoes.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 < s.size(); i++) {
      |                   ~~^~~~~~~~~~
shoes.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for (int i = 0; i < s.size(); i++) {
      |                   ~~^~~~~~~~~~
shoes.cpp:37:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |   for (int i = 0; i < s.size(); i++) {
      |                   ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15