Submission #153396

#	Time	Username	Problem	Language	Result	Execution time	Memory
153396		nandonathaniel	Arranging Shoes (IOI19_shoes)	C++14	85 / 100	33 ms	2692 KiB

shoes

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

vector<LL> neg[1005],pos[1005];

long long count_swaps(vector<int> s) {
	LL n=(LL)s.size()/2;
	if((LL)s.size()<=2000){
		vector<LL> hasil;
		vector<pii> V;
		for(int i=0;i<s.size();i++){
			if(s[i]<0)neg[abs(s[i])].push_back(i);
			else pos[s[i]].push_back(i);
		}
		for(int i=1;i<=n;i++){
			for(int j=0;j<neg[i].size();j++){
				V.push_back({min(neg[i][j],pos[i][j]),i});
			}
		}
		sort(V.begin(),V.end());
		for(auto isi : V){
			hasil.push_back(-isi.second);
			hasil.push_back(isi.second);
		}
		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:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<neg[i].size();j++){
                ~^~~~~~~~~~~~~~
shoes.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(LL i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(LL j=i;j<s.size();j++){
               ~^~~~~~~~~
shoes.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:49:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
shoes.cpp:30:7: 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: 20 / 20
• Subtask 6: 0 / 15