Submission #822950

#	Time	Username	Problem	Language	Result	Execution time	Memory
822950		vjudge1	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	212 KiB

shoes

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

long long count_swaps(vector<int> s) {
	long long ans = 0, x = 0, n = s.size(), sum = 0;
	map <int, int> last;
	for (int i = -n ; i <= n ; i++)
		last[i] = -1;
	for (int i = 0 ; i < n ; i++){
		if (last[s[i] * -1] > -1){
			ans+=i - last[s[i] * -1] - 1;
			if (s[i] < 0)
				ans++;
			x--;
			last[s[i] * -1] = -1;
		}
		else{
			last[s[i]] = i + x;
			x++;
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:6:42: warning: unused variable 'sum' [-Wunused-variable]
    6 |  long long ans = 0, x = 0, n = s.size(), sum = 0;
      |                                          ^~~

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