Submission #1369770

#	Time	Username	Problem	Language	Result	Execution time	Memory
1369770		moha1111	Arranging Shoes (IOI19_shoes)	C++20	65 / 100	8 ms	1960 KiB

shoes

	// #include "shoes.h"
	#include "bits/stdc++.h"
	using namespace std;

	long long count_swaps(std::vector<int> s) {
		long long n = s.size() / 2;
		if(n > 1000)
			return (n - 1) * n / 2;

		if(n <= 1000)	
		{
			long long i = 0 , ans = 0;
			while(i < 2 * n)
			{
				int bad = -1;
				for(int j = i + 1 ; j < 2 * n ; j++)
				{
					if(s[i] == -s[j])
					{
						bad = j;
						break;
					}
				}
				while(bad != i + 1)
				{
					swap(s[bad] , s[bad - 1]);
					ans++;
					bad--;
				}
				if(s[i] > 0)
				{
					swap(s[i] , s[i + 1]);
					ans++;
				}
				i += 2;
			}
			return ans;
		}
	}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:39:9: warning: control reaches end of non-void function [-Wreturn-type]
   39 |         }
      |         ^

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