Submission #465696

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
465696	2021-08-16 16:38:31	tomsyd	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1084 ms	5396 KiB

shoes

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#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
bool ok(vector<int>& s){
  for (int i=1; i<s.size(); i += 2){
    if (s[i-1] < 0 and -s[i-1] == s[i]){
      continue;
    }
    return false;
  }
  return true;
}
long long count_swaps(vector<int> s) {
  vector<pair<int,int>> v;
  for (int i=1; i<s.size(); ++i){
    v.emplace_back(i-1,i);
  }
  int ans = 1e9;
  if (ok(s)) ans = 0;
  do{
    vector<int> cp = s;
    int cnt = 0;
    for (auto j:v){
      swap(cp[j.first],cp[j.second]);
      ++cnt;
      if (ok(cp)) break;
    }
    ans = min(ans,cnt);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

shoes.cpp: In function 'bool ok(std::vector<int>&)':
shoes.cpp:6:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |  for (int i=1; i<s.size(); i += 2){
      |                ~^~~~~~~~~
shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:17:17: 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=1; 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