Submission #813687

#	Time	Username	Problem	Language	Result	Execution time	Memory
813687		math_rabbit_1028	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1085 ms	1876 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int n;

long long count_swaps(std::vector<int> s) {
	int ans = 0;
	n = s.size()/2;
	for (int i = 0; i < 2 * n; i += 2) {
		int k;
		for (int j = i + 1; j < 2 * n; j++) {
			if (-s[i] == s[j]) {
				k = j;
				break;
			}
		}
		for (int j = k - 1; j > i; j--) {
			swap(s[j + 1], s[j]);
			ans++;
		}
		if (s[i] > 0) {
			swap(s[i], s[i + 1]);
			ans++;
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:18:12: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |   for (int j = k - 1; j > i; j--) {
      |            ^

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