Submission #143759

#	Time	Username	Problem	Language	Result	Execution time	Memory
143759		dacin21	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1033 ms	2040 KiB

shoes

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

using ll = int64_t;

long long count_swaps(std::vector<int> v) {
    const int n = v.size()/2;
    ll ret = 0;
    for(int i=0;i<n;++i){
        const int l = 2*i;
        int a = l;
        while(v[a] > 0) ++a;
        ret += a-l;
        rotate(v.begin()+l, v.begin()+a, v.begin()+a+1);
        assert(v[l] < 0);
        int b = l+1;
        while(v[b] != -v[l]) ++b;
        ret+=b-l-1;
        rotate(v.begin()+l+1, v.begin()+b, v.begin()+b+1);
        assert(v[l+1] == -v[l]);
    }
    return ret;
}

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