Submission #549840

#	Time	Username	Problem	Language	Result	Execution time	Memory
549840		esomer	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1084 ms	3120 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>

using namespace std;

#define intt long long

long long count_swaps(vector<int> s) {
	intt ans = 0;
  for(int i = 0; i < s.size(); i += 2){
    int ind;
    for(int j = i + 1; j < s.size(); j++){
      if(-s[j] == s[i]){
        ind = j;
        break;
      }
    }
    for(int j = ind - 1; j > i; j--){
      s[j + 1] = s[j];
      ans++;
    }
    if(s[i] < 0) s[i + 1] = -s[i];
    else{
      ans++;
      s[i + 1] = s[i];
      s[i] = -s[i];
    }
  }
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:10:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |   for(int i = 0; i < s.size(); i += 2){
      |                  ~~^~~~~~~~~~
shoes.cpp:12:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int j = i + 1; j < s.size(); j++){
      |                        ~~^~~~~~~~~~
shoes.cpp:18:13: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |     for(int j = ind - 1; j > i; j--){
      |             ^

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