Submission #390685

#	Time	Username	Problem	Language	Result	Execution time	Memory
390685		JimmyZJX	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1094 ms	3120 KiB

shoes

#include <iostream>
#include <fstream>
#include <algorithm>
#include <cstring>
#include <climits>
#include <cassert>
#include <tuple>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <string>
#include <unordered_set>
#include <unordered_map>

using namespace std;

typedef long long LL;
typedef vector<int> Vi;
typedef vector<bool> Vb;
typedef vector<vector<int>> Vii;

#define forR(i, n) for (int i = 0; i < (n); i++)

LL count_swaps(Vi S) {
	int n = S.size() / 2;

	LL ans = 0;
	forR(i, n) {
		int p = i * 2;
		int Sp = S[p];

		int q = p + 1;
		while (S[q] != -Sp) q++;
		while (q > p + 1) {
			swap(S[q], S[q - 1]);
			q--;
			ans++;
		}
		if (S[p] > 0) ans++;
	}

	return ans;
}

#ifdef TEST_LOCAL
int main() {
	auto c = count_swaps(Vi{ 2, 1, -1, -2 });
	c = count_swaps(Vi{ -2, 2, 2, -2, -2, 2 });
	
	return 0;
}
#endif

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