Submission #519651

#	Time	Username	Problem	Language	Result	Execution time	Memory
519651		CasperWong	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1063 ms	139548 KiB

shoes

#include<bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int>s){
	long long n=s.size()/2,ans=0;
	queue<long long>pr[2*n+100];
	vector<long long>vec={};
	for(int i=-n;i<=n;i++) while(pr[i+n].size()) pr[i+n].pop();
	for(int i=0;i<2*n;i++) pr[s[i]+n].push(i);
	for(int i=0;i<2*n;i++){
		if(!s[i]) continue;
		if(s[i]>0) ans++;
		vec.push_back(pr[-s[i]+n].front());
		s[pr[-s[i]+n].front()]=0;
		sort(vec.begin(),vec.end());
		reverse(vec.begin(),vec.end());
		while(vec.back()<=i) vec.pop_back();
		for(auto j:vec) if((j>i)&&(j<pr[-s[i]+n].front())) ans--;
		ans+=abs(pr[-s[i]+n].front()-i)-1;
		pr[s[i]+n].pop();
		pr[-s[i]+n].pop();
		if(s[i]==-s[i+1]) i++;
	//	cerr<<ans<<endl;
	}
	return ans;
}

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