Submission #298205

#	Time	Username	Problem	Language	Result	Execution time	Memory
298205		arayi	Arranging Shoes (IOI19_shoes)	C++17	0 / 100	114 ms	135032 KiB

shoes

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

const int N = 2e5 + 30;
stack <int> a[N];
long long pat;
int v(int x)
{
    if(x < 0) return -1;
    else return 1;
}
long long count_swaps(std::vector<int> s) {
    long long n = s.size();
    return n * (n - 1LL) / 2LL;
	for (int i = 1; i <= s.size(); i++)
	{
	    int x = abs(s[i - 1]);
	    if(a[x].empty() || v(s[i - 1]) == v(a[x].top()))
            a[x].push(i * v(s[i - 1]));
        else
        {
            pat += i - abs(a[x].top());
            a[x].pop();
            if(s[i - 1] > 0) pat--;
        }
	}
	return pat;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:16:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |  for (int i = 1; i <= s.size(); i++)
      |                  ~~^~~~~~~~~~~

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