Submission #151165

#	Time	Username	Problem	Language	Result	Execution time	Memory
151165		nandonathaniel	Arranging Shoes (IOI19_shoes)	C++14	65 / 100	34 ms	3836 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;

LL a[100],V[100];

long long count_swaps(vector<int> s) {
	if((LL)s.size()<=16){
		LL n=(LL)s.size(),now=0;
		n/=2;
		for(LL i=0;i<s.size();i++){
			if(s[i]>0){
				now++;
				a[now]=s[i];
				V[now]=now;
			}
		}
		vector<int> t=s;
		LL ans=1e18;
		do{
			s=t;
			LL res=0;
			vector<LL> hasil;
			for(LL i=1;i<=n;i++){
				hasil.push_back(-a[V[i]]);
				hasil.push_back(a[V[i]]);
			}
			//for(LL i=1;i<=2*n;i++)cout << hasil[i-1] << endl;
			for(LL i=0;i<s.size();i++){
				LL no;
				for(LL j=i;j<s.size();j++){
					if(s[j]==hasil[i]){
						no=j;
						break;
					}
				}
				for(LL j=no;j>=i+1;j--){
					swap(s[j],s[j-1]);
					res++;
				}
			}
			ans=min(ans,res);
		}while(next_permutation(V+1,V+n+1));
		return ans;
	}
	vector<int> v;
	for(int i=0;i<s.size();i++){
		if(s[i]<0)v.push_back(i);
	}
	long long now=0,ans=0;
	for(int i=0;i<s.size();i++){
		if(i%2==0){
			ans+=abs(v[now]-i);
			now++;
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(LL i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:30:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(LL i=0;i<s.size();i++){
               ~^~~~~~~~~
shoes.cpp:32:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(LL j=i;j<s.size();j++){
                ~^~~~~~~~~
shoes.cpp:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:31:8: warning: 'no' may be used uninitialized in this function [-Wmaybe-uninitialized]
     LL no;
        ^~

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