Submission #298827

#	Time	Username	Problem	Language	Result	Execution time	Memory
298827		Aldas25	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	62 ms	5112 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define f first
#define s second
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;

const int MAXN = 100100;

bool ch[MAXN];

long long count_swaps(std::vector<int> s) {
    int n = (int)s.size();

    ll ret = 0;
    FOR(i, 0, n-1) {
        if (ch[i]) continue;
        FOR(j, i+1, n-1) {
            if (ch[j]) continue;
            if (abs(s[i]) == abs(s[j]) && s[i] != s[j]) {
                ch[i] = ch[j] = true;
                if (s[i] > s[j]) ret++;
                break;
            }
            ret++;
        }
    }

	return ret;
}

/*

2
2 1 -1 -2
ans:
4

3
-2 2 2 -2 -2 2
ans:
1


*/

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