제출 #525966

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
525966		Hanksburger	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	43 ms	15836 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
vector<int> pos[100005];
int a[100005], cnt;
long long f(int l, int r)
{
	if (l==r)
		return 0;
	int mid=(l+r)/2, index=(l+r)/2+1;
	long long res=f(l, mid)+f(mid+1, r);
	for (int i=l; i<=mid; i++)
	{
		while (index<=r && a[i]>a[index])
			index++;
		res+=index-mid-1;
	}
	sort(a+l, a+r+1);
	return res;
}
long long count_swaps(vector<int> v)
{
	for (int i=0; i<v.size(); i++)
		if (v[i]>0)
			pos[v[i]].push_back(i);
	for (int i=1; i<=v.size(); i++)
		reverse(pos[i].begin(), pos[i].end());
	for (int i=0; i<v.size(); i++)
	{
		if (v[i]<0)
		{
			
			cnt+=2;
			a[i]=cnt-1;
			a[pos[-v[i]][pos[-v[i]].size()-1]]=cnt;
			pos[-v[i]].pop_back();
		}
	}
	return f(0, cnt-1);
}

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:22:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for (int i=0; i<v.size(); i++)
      |                ~^~~~~~~~~
shoes.cpp:25:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  for (int i=1; i<=v.size(); i++)
      |                ~^~~~~~~~~~
shoes.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |  for (int i=0; i<v.size(); i++)
      |                ~^~~~~~~~~

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