Submission #1135265

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135265		vibeduck	Arranging Shoes (IOI19_shoes)	C++20	50 / 100	1096 ms	2632 KiB

shoes

#include "shoes.h"
//#define int long long

long long count_swaps(std::vector<int> s) {
	int n = (int)s.size();
    std::vector<int> in(n, 1);
    long long ans = 0;
    for (int i = 0; i < n; i++) {
        if (!in[i]) continue;
        int bw = 0; int x = -1;
        for (int j = i + 1; j < n; j++) {
            if (!in[j]) continue;
            if (s[j] == -s[i]) {
                x = j;
                break;
            }
            bw++;
        }
        ans += (long long)bw + (long long)((bool)(s[i] > s[x]));
        in[x] = 0;
    }
    return ans;
}

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