Submission #867106

#	Time	Username	Problem	Language	Result	Execution time	Memory
867106		Malix	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	0 ms	348 KiB

shoes

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

long long count_swaps(std::vector<int> s) {
	int n=s.size();
	int pos=0;
	vector<int> arr(n,0);
	vector<int> arr2;
	vector<vector<int>> po(n+1);
	vector<vector<int>> ne(n+1);
	for(int i=0;i<n;i++){
		if(s[i]<0)ne[-s[i]].push_back(i);
		else po[s[i]].push_back(i);
	}
	long long ans=0;
	while(pos<n){
		if(arr[pos]==1){
			pos++;continue;
		}
		if(s[pos]<0){
			int it=po[-s[pos]][0];
			po[-s[pos]].erase(po[-s[pos]].begin());
			ne[-s[pos]].erase(ne[-s[pos]].begin());
			int it1=lower_bound(arr2.begin(),arr2.end(),it)-arr2.begin();
			int it2=lower_bound(arr2.begin(),arr2.end(),pos)-arr2.begin();
			ans+=it-pos-1-it2+it1;
			s[pos]=0;s[it]=0;
			arr[pos]=1;arr[it]=1;
			arr2.push_back(it-1);
		}
		else{
			int it=ne[s[pos]][0];
			ne[s[pos]].erase(ne[s[pos]].begin());
			po[s[pos]].erase(po[s[pos]].begin());
			int it1=lower_bound(arr2.begin(),arr2.end(),it)-arr2.begin();
			int it2=lower_bound(arr2.begin(),arr2.end(),pos)-arr2.begin();
			ans+=it-pos-it2+it1;
			s[pos]=0;s[it]=0;
			arr[pos]=1;arr[it]=1;
			arr2.push_back(it-1);
		}
		sort(arr2.begin(),arr2.end(),greater<int>());
		pos++;
	}
	return ans;
}

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