Submission #1045424

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045424		vjudge1	Arranging Shoes (IOI19_shoes)	C++17	30 / 100	1078 ms	80708 KiB

shoes

#include "shoes.h"
#include<bits/extc++.h>
#include<bits/stdc++.h>
using namespace __gnu_pbds;
using namespace std;
queue<int> otherpos[100100];
long long calc(vector<int>v){
    long long ans=0;
    int K=0;
    tree<int,null_type,less<>,rb_tree_tag,tree_order_statistics_node_update>st;
    for(auto i:v) {
        st.insert(i);
        ans+=K++-st.order_of_key(i);
    }
    return ans;
}
long long count_swaps(std::vector<int> s) {
    long long ans=1e9;
    int n=s.size()>>1;
    vector<int>sup;
    sup.resize(2*n);
    vector<int>perm(n);
    iota(perm.begin(),perm.end(),0);
    do {
        int CC=0;
        for(int i=0;i<n*2;i++)
            if(s[i]<0) sup[i]=2*perm[CC],
                otherpos[-s[i]].push(2*perm[CC++]+1);
        for(int i=0;i<n*2;i++)if(s[i]>0)
            sup[i]=otherpos[s[i]].front(),otherpos[s[i]].pop();
        ans=min(ans,calc(sup));
    } while(next_permutation(perm.begin(),perm.end()));
    return ans;
}

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