Submission #227699

#	Time	Username	Problem	Language	Result	Execution time	Memory
227699		Romario8	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	5 ms	384 KiB

shoes

#include<bits/stdc++.h>
#define ll long long
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,a,b) for(ll i=a;i>=b;i--)
#define pb push_back
#define rl "\n"
#define x first
#define y second
using namespace std;
long long count_swaps(vector<int> s)
{
    ll ans=0;
    ll n=s.size();
    vector<vector<ll>> pr(2*n+1);
    rep(i,0,n)
    {
        pr[s[i]+n].pb(i);
        if(pr[-s[i]+n].size()!=0)
        {
            ans+=i-pr[-s[i]+n][0];
            if(s[i]>0)ans--;
            pr[-s[i]+n].erase(pr[-s[i]+n].begin());
            pr[s[i]+n].erase(pr[s[i]+n].begin());
        }
    }
	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