HDU/HDOJ 2446 Shell Pyramid 2008 Asia Regional Harbin

Shell Pyramid

Time Limit : 5000/1000ms (Java/Other)Memory Limit : 32768/32768K (Java/Other)

Total Submission(s) : 6Accepted Submission(s) : 5

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Problem Description

In the 17th century, with thunderous noise, dense smoke and blazing fire, battles on the sea were just the same as those in the modern times. But at that time, the cannon ,were extremely simple. It was just like an iron cylinder, with its rearward end sealed and forward end open. There was a small hole at the rearward end of it, which was used to install the fuse. The cannons on the warships were put on small vehicles which had four wheels and the shells were iron spheres with gunpowder in them.

At that time, it was said that there was an intelligent captain, who was also a mathematician amateur. He liked to connect everything him met to mathematics. Before every battle, he often ordered the soldiers to put the shells on the deck and make those shells to form shell pyramids.

Now let's suppose that a shell pyramid has four layers, and there will be a sequence of ordinal numbers in every layer. They are as the following figure:



In the figure, they are the first layer, the second layer, the third layer and the fourth layer respectively from the left to the right.

In the first layer, there is just 1 shell, and its ordinal number is 1. In the second layer, there are 3 shells, and their ordinal numbers are 1, 2, and 3. In the third layer, there are 6 shells, and their ordinal numbers are 1, 2, 3, 4, 5, and 6. In the fourth layer, there are 10 shells, and their ordinal numbers are shown in the figure above.

There are also serial numbers for the whole shell pyramid. For example, the serial number for the third shell in the second layer is 4, the serial number for the fifth shell in the third layer is 9, and the serial number for the ninth shell in the fourth layer is 19.

There is also a interrelated problem: If given one serial number s, then we can work out the s th shell is in what layer, what row and what column. Assume that the layer number is i, the row number is j and the column number is k, therefore, if s=19, then i=4, j=4 and k=3.

Now let us continue to tell about the story about the captain.
A battle was going to begin. The captain allotted the same amount of shells to every cannon. The shells were piled on the deck which formed the same shell pyramids by the cannon. While the enemy warships were near, the captain ordered to fire simultaneously. Thunderous sound then was heard. The captain listened carefully, then he knew that how many shells were used and how many were left.

At the end of the battle, the captain won. During the break, he asked his subordinate a question: For a shell pyramid, if given the serial number s, how do you calculate the layer number i, the row number j and column number k?

Input

First input a number n,repersent n cases.For each case there a shell pyramid which is big enough, a integer is given, and this integer is the serial number s（s<2^63）. There are several test cases. Input is terminated by the end of file.

Output

For each case, output the corresponding layer number i, row number j and column number k.

Sample Input

2
19
75822050528572544

Sample Output

4 4 3
769099 111570 11179

Source

2008 Asia Regional Harbin

这个题，题目很长，需要耐心的读，这里我直接摘抄一下他的题意吧。

题目大意：这道题说的是叠金字塔啦，最顶层是1，第二层是3，之后每一层的数量都是上面一层的数量加当前层数的值啦。所以呢，一层金字塔有1个球，两层金字塔有1+3 = 4个球，三层金字塔就有1+3+6 = 10个的球。现在给你一个编号s，问你它在金字塔中的第几层，第几行，第几列。例如19，它就在第四层，第四行，第三列。

我的做法很简单，直接去计算他是哪一层，哪一行，哪一列即可；

可以用放缩法大致确定范围，然后再一个小区间里面暴力就OK了。思路一定要清晰

我的代码：

#include<stdio.h>
#include<math.h>
typedef __int64 ll;

ll f1(ll n)
{
	return n*(n+1)*(n+2);
}

ll f2(ll n)
{
	return n*(n+1);
}

int main()
{
	ll s,t,tmp1,tmp2,tmp3,i,j,k,n;
	ll ans1,ans2,ans3;
	scanf("%I64d",&t);
	while(t--)
	{
		scanf("%I64d",&s);
		tmp1=(ll)pow(s*6.0,1.0/3.0)-2;
		for(i=tmp1;;i++)
			if(f1(i)>=6*s)
				break;
		ans1=i-1;
		n=f1(ans1+1)/6-f1(ans1)/6;
		s=s-f1(ans1)/6;
		tmp2=(ll)pow(s*2.0,0.5);
		for(i=tmp2;;i++)
			if(f2(i)>=2*s)
				break;
		ans2=i-1;
		ans3=s-f2(ans2)/2;
		printf("%I64d %I64d %I64d\n",ans1+1,ans2+1,ans3);
	}
	return 0;
}