Submission #153395

#	Time	Username	Problem	Language	Result	Execution time	Memory
153395		nandonathaniel	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	34 ms	3956 KiB

shoes

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

pii pas[1005];

long long count_swaps(vector<int> s) {
	if((LL)s.size()<=2000){
		vector<LL> hasil;
		LL n=(LL)s.size()/2;
		for(LL i=1;i<=n;i++)pas[i]={-1,-1};
		for(int i=0;i<s.size();i++){
			if(s[i]<0)pas[abs(s[i])].first=i;
			else pas[s[i]].second=i;
			if(pas[abs(s[i])].first!=-1 && pas[abs(s[i])].second!=-1){
				pas[abs(s[i])].first=-1;
				pas[abs(s[i])].second=-1;
			}
			else{
				hasil.push_back(-abs(s[i]));
				hasil.push_back(abs(s[i]));
			}
		}
		LL res=0;
		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++;
			}
		}
		return res;
	}
	vector<int> v;
	for(int i=0;i<s.size();i++){
		if(s[i]<0)v.push_back(i);
	}
	LL 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:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<s.size();i++){
               ~^~~~~~~~~
shoes.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(LL i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(LL j=i;j<s.size();j++){
               ~^~~~~~~~~
shoes.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:28:7: warning: 'no' may be used uninitialized in this function [-Wmaybe-uninitialized]
    LL no;
       ^~

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