제출 #520983

#제출 시각아이디문제언어결과실행 시간메모리
520983ColourAttilaArranging Shoes (IOI19_shoes)C++17
25 / 100
17 ms1868 KiB
#include "shoes.h"
#include<bits/stdc++.h>

using namespace std;

long long count_swaps(std::vector<int> s) {
	if(s.size() == 2) {
        return s[0] < 0 ? 0 : 1;
	}
	
	long long n = s.size()/2;
	return (n * (n-1)/2);
}
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