Submission #368099

#	Time	Username	Problem	Language	Result	Execution time	Memory
368099		leinad2	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1094 ms	8892 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int>s)
{
    long long ans=0;
    int cnt=0, A[200010]={}, i, j;
    vector<int>v[100010];
    for(i=0;i<s.size();i++)
    {
        if(s[i]<0)
        {
            v[-s[i]].push_back(++cnt);
            A[i+1]=cnt*2-1;
        }
    }
    int n=s.size();
    for(i=0;i++<n/2;)reverse(v[i].begin(), v[i].end());
    for(cnt=i=0;i<s.size();i++)
    {
        if(s[i]>0)
        {
            A[i+1]=2*v[s[i]].back();
            v[s[i]].pop_back();
        }
    }
  int B[200010]={};
  for(i=0;i++<n;)
  {
    B[A[i]]=1;  }
  for(i=0;i++<n;)if(!B[i])for(;;);
    for(i=0;i++<n;)
    {
        for(j=0;++j<n;)
        {
            if(A[j]>A[j+1])
            {
                ans++;
                swap(A[j], A[j+1]);
            }
        }
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:9:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(i=0;i<s.size();i++)
      |             ~^~~~~~~~~
shoes.cpp:19:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(cnt=i=0;i<s.size();i++)
      |                 ~^~~~~~~~~
shoes.cpp:31:27: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   31 |   for(i=0;i++<n;)if(!B[i])for(;;);
      |                           ^~~
shoes.cpp:32:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   32 |     for(i=0;i++<n;)
      |     ^~~

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