Submission #201726

#	Time	Username	Problem	Language	Result	Execution time	Memory
201726		a_player	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	140 ms	135056 KiB

shoes

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e5+10;

deque<int> d[2*MAXN];
int sh[MAXN];
bitset<MAXN> v;

long long count_swaps(vector<int> s) {
    int N=s.size();
	for(int i=0;i<N;i++)d[s[i]+MAXN].push_back(i);
    long long ans=0;
    int cont=0;
    for(int i=0;i<N;i++){
        if(v[i])continue;
        cont+=sh[i];
        v[i]=1;
        sh[i+1]++;
        assert(d[s[i]+MAXN].front()==i);
        d[s[i]+MAXN].pop_front();
            int h=d[MAXN-s[i]].front();
            v[h]=1;
            sh[h]--;
            d[MAXN-s[i]].pop_front();
            if(s[i]>0&&(i+cont)%2==1)ans+=h-i-1;
            else if(s[i]<0&&(i+cont)%2==0)ans+=h-i-1;
            else if(s[i]>0&&(i+cont)%2==0)ans+=h-i;
            else ans+=h-i;
    }
    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