Best_Cow_Line

最新推荐文章于 2021-12-12 11:50:02 发布

原创最新推荐文章于 2021-12-12 11:50:02 发布 · 537 阅读

0 ·

CC 4.0 BY-SA版权

ACM 专栏收录该内容

11 篇文章

订阅专栏

本文深入探讨了排序算法、动态规划、哈希算法等在数据结构优化中的关键作用，通过实例展示了如何高效地处理数据，提高系统的性能。

Description

FJ is about to take his N (1 ≤ N ≤ 2,000) cows to the annual"Farmer of the Year" competition. In this contest every farmer arranges his cows in a line and herds them past the judges.

The contest organizers adopted a new registration scheme this year: simply register the initial letter of every cow in the order they will appear (i.e., If FJ takes Bessie, Sylvia, and Dora in that order he just registers BSD). After the registration phase ends, every group is judged in increasing lexicographic order according to the string of the initials of the cows' names.

FJ is very busy this year and has to hurry back to his farm, so he wants to be judged as early as possible. He decides to rearrange his cows, who have already lined up, before registering them.

FJ marks a location for a new line of the competing cows. He then proceeds to marshal the cows from the old line to the new one by repeatedly sending either the first or last cow in the (remainder of the) original line to the end of the new line. When he's finished, FJ takes his cows for registration in this new order.

Given the initial order of his cows, determine the least lexicographic string of initials he can make this way.

Input

* Line 1: A single integer: N
* Lines 2..N+1: Line i+1 contains a single initial ('A'..'Z') of the cow in the ith position in the original line

Output

The least lexicographic string he can make. Every line (except perhaps the last one) contains the initials of 80 cows ('A'..'Z') in the new line.

Sample Input

6
A
C
D
B
C
B

Sample Output

ABCBCD

#include "iostream"
#include "string"

using namespace std;

int N;
string S[2001];

void solve()
{
	int lo = 0;
	int hi = N - 1;
	int cnt = 0;

	while(lo <= hi)
	{
		bool leftishigh = false;
		for(int i = 0; lo + i <= hi - i; ++i)
		{
			if(S[lo + i] > S[hi - i])
			{
				leftishigh = true;
				break;
			}
			else if(S[lo + i] < S[hi - i])
			{
				leftishigh = false;
				break;
			}
		}

		if(leftishigh) cout << S[hi--];
		else cout << S[lo++];

		cnt++;

		if(cnt % 80 == 0) cout << endl;
	}

	
}



int main(int argc, char const *argv[])
{
	cin >> N;
	for(int i = 0; i < N; ++i)
	{
		cin >> S[i];
	}
	solve();
	return 0;
}

除了每行80个字符外没什么难度