解题报告 之 CodeForces 581D Three Logos

本文介绍了一道编程竞赛题目的解决方案,题目要求判断三个矩形是否能够组合成一个正方形,并输出组合方式。文章给出了具体的实现代码,并分享了解题思路。

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解题报告 之 CodeForces 581D Three Logos


Description

Three companies decided to order a billboard with pictures of their logos. A billboard is a big square board. A logo of each company is a rectangle of a non-zero area.

Advertisers will put up the ad only if it is possible to place all three logos on the billboard so that they do not overlap and the billboard has no empty space left. When you put a logo on the billboard, you should rotate it so that the sides were parallel to the sides of the billboard.

Your task is to determine if it is possible to put the logos of all the three companies on some square billboard without breaking any of the described rules.

Input

The first line of the input contains six positive integers x1, y1, x2, y2, x3, y3 (1 ≤ x1, y1, x2, y2, x3, y3 ≤ 100), where xi and yi determine the length and width of the logo of the i-th company respectively.

Output

If it is impossible to place all the three logos on a square shield, print a single integer "-1" (without the quotes).

If it is possible, print in the first line the length of a side of square n, where you can place all the three logos. Each of the next n lines should contain n uppercase English letters "A", "B" or "C". The sets of the same letters should form solid rectangles, provided that:

  • the sizes of the rectangle composed from letters "A" should be equal to the sizes of the logo of the first company,
  • the sizes of the rectangle composed from letters "B" should be equal to the sizes of the logo of the second company,
  • the sizes of the rectangle composed from letters "C" should be equal to the sizes of the logo of the third company,

Note that the logos of the companies can be rotated for printing on the billboard. The billboard mustn't have any empty space. If a square billboard can be filled with the logos in multiple ways, you are allowed to print any of them.

See the samples to better understand the statement.

Sample Input

Input
5 1 2 5 5 2
Output
5
AAAAA
BBBBB
BBBBB
CCCCC
CCCCC
Input
4 4 2 6 4 2
Output
6
BBBBBB
BBBBBB
AAAACC
AAAACC
AAAACC
AAAACC

Source


题目大意:给你三个矩形的长宽高,问你能不能拼成一个正方形,如果能,则输出三个矩形的分布(分别对应A、B、C字符)。如果不能,输出-1。

分析:一道大水。还是要冷静才行啊。。。这个题首先明确能构成正方形的条件就是:最长边^2=三个矩形的面积和,同时这个最长边即作为正方形的边长len。具体地,首先得到三个矩形的长宽,先旋转为卧倒的矩形(上下边>=左右腰)。之后找到最长边,判断能否构成正方形。如果能,那么这个最长边的矩形一定可以卧放在正方形的顶部(也可以放在其他地方,但一定可以旋转到顶部)。

然后剩下下面的部分,这个地方有一些陷阱,最简单规避陷阱的方法就是分情况讨论,要不然就是三个矩形都依次卧放;要不就是两个矩形都竖着放。那么就试一下咯,随便选一个剩下的矩形(这里称之为X),如果X的较长边==len或者X的较短边刚好加上顶上矩形的腰长==len,那么就不用旋转;否则就旋转。最后的一个矩形把剩下的地方补齐即可。

上代码:
#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<cmath>
using namespace std;
typedef long long ll;

struct Rec
{
	int l, w;
	char ch;
	bool operator <( const Rec& rhs )const
	{
		return l < rhs.l;
	}
	int sq()
	{
		return l*w;
	}
};

Rec rec[4];



int main()
{
	while(scanf( "%d%d%d%d%d%d", &rec[1].l, &rec[1].w, &rec[2].l, &rec[2].w, &rec[3].l, &rec[3].w ) == 6)
	{
		for(int i = 1; i <= 3; i++)
		{
			if(rec[i].l < rec[i].w)swap( rec[i].l, rec[i].w );
			rec[i].ch = 'A' - 1 + i;
		}

		sort( rec + 1, rec + 4 );

		int len = rec[3].l;

		if((rec[3].l*rec[3].l) != (rec[1].sq() + rec[2].sq() + rec[3].sq()))
		{
			printf( "-1\n" );
			continue;
		}

		printf( "%d\n", len );

		for(int i = 1; i <= rec[3].w; i++)
		{
			for(int j = 1; j <= rec[3].l; j++)
			{
				printf( "%c", rec[3].ch );
			}
			printf( "\n" );
		}

		if(rec[2].l!=len&&rec[3].w + rec[2].w != len) swap( rec[2].l, rec[2].w );
		for(int i = 1; i <= rec[2].w; i++)
		{
			for(int j = 1; j <= rec[2].l; j++)
			{
				printf( "%c", rec[2].ch );
			}
			for(int j = 1; j <= len - rec[2].l; j++)
			{
				printf( "%c", rec[1].ch );
			}
			printf( "\n" );
		}

		for(int i = 1; i <=len-rec[3].w- rec[2].w; i++)
		{
			for(int j = 1; j <= len; j++)
			{
				printf( "%c", rec[1].ch );
			}
			printf( "\n" );
		}


	}
	return 0;
}

首先再次赞叹队友叔叔的高智商。另外第一次感到做CF的乐趣在于一定要保持头脑的清晰,就会发现其实都不难。
区域赛加油!祝前队长大大拿金牌~
### Codeforces 1487D Problem Solution The problem described involves determining the maximum amount of a product that can be created from given quantities of ingredients under an idealized production process. For this specific case on Codeforces with problem number 1487D, while direct details about this exact question are not provided here, similar problems often involve resource allocation or limiting reagent type calculations. For instance, when faced with such constraints-based questions where multiple resources contribute to producing one unit of output but at different ratios, finding the bottleneck becomes crucial. In another context related to crafting items using various materials, it was determined that the formula `min(a[0],a[1],a[2]/2,a[3]/7,a[4]/4)` could represent how these limits interact[^1]. However, applying this directly without knowing specifics like what each array element represents in relation to the actual requirements for creating "philosophical stones" as mentioned would require adjustments based upon the precise conditions outlined within 1487D itself. To solve or discuss solutions effectively regarding Codeforces' challenge numbered 1487D: - Carefully read through all aspects presented by the contest organizers. - Identify which ingredient or component acts as the primary constraint towards achieving full capacity utilization. - Implement logic reflecting those relationships accurately; typically involving loops, conditionals, and possibly dynamic programming depending on complexity level required beyond simple minimum value determination across adjusted inputs. ```cpp #include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<long long> a(n); for(int i=0;i<n;++i){ cin>>a[i]; } // Assuming indices correspond appropriately per problem statement's ratio requirement cout << min({a[0], a[1], a[2]/2LL, a[3]/7LL, a[4]/4LL}) << endl; } ``` --related questions-- 1. How does identifying bottlenecks help optimize algorithms solving constrained optimization problems? 2. What strategies should contestants adopt when translating mathematical formulas into code during competitive coding events? 3. Can you explain why understanding input-output relations is critical before implementing any algorithmic approach? 4. In what ways do prefix-suffix-middle frameworks enhance model training efficiency outside of just tokenization improvements? 5. Why might adjusting sample proportions specifically benefit models designed for tasks requiring both strong linguistic comprehension alongside logical reasoning skills?
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