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HDU1130 卡特兰数

时间:2016-04-23 19:44:15      阅读:121      评论:0      收藏:0      [点我收藏+]

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How Many Trees?

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 3397    Accepted Submission(s): 1964


Problem Description
A binary search tree is a binary tree with root k such that any node v reachable from its left has label (v) <label (k) and any node w reachable from its right has label (w) > label (k). It is a search structure which can find a node with label x in O(n log n) average time, where n is the size of the tree (number of vertices).

Given a number n, can you tell how many different binary search trees may be constructed with a set of numbers of size n such that each element of the set will be associated to the label of exactly one node in a binary search tree?
 

 

Input
The input will contain a number 1 <= i <= 100 per line representing the number of elements of the set.
 

 

Output
You have to print a line in the output for each entry with the answer to the previous question.
 

 

Sample Input
1 2 3
 

 

Sample Output
1 2 5
 

 

Source
 

 

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卡特兰数 




#include<iostream>  
#include<cstring>  
#include<string>  
#include<cstdio>  
#include<algorithm>  
using namespace std;  
const int base = 10000;  
const int N = 100 + 2;  
int katelan[N][N];  
int main()  
{  
    katelan[1][1] = 1;  
    katelan[2][1] = 2;  
    katelan[3][1] = 5;  
    for (int i = 4; i <= 100; i++)  
    {  
        for (int j =1; j<100; j++)//大数乘法  
        {  
            katelan[i][j] += katelan[i - 1][j] * (4 * i - 2);  
            katelan[i][j + 1] += katelan[i][j] / base;  
            katelan[i][j] %= base;  
        }  
        int temp;  
        for (int j = 100; j > 0; j--)//大数除法  
        {  
            temp=katelan[i][j] % (i + 1);  
            katelan[i][j-1]+=temp* base;  
            katelan[i][j] /= (i + 1);  
        }  
    }  
    int n;  
    while (cin >> n)  
    {  
        int i = 100;  
        while (katelan[n][i] == 0)i--;  
        cout << katelan[n][i--];  
        while (i > 0)  
            printf("%04d", katelan[n][i--]);  
        cout << endl;  
    }  
    return 0;  
}

 

HDU1130 卡特兰数

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原文地址:http://www.cnblogs.com/Ritchie/p/5425323.html

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