hdoj--1028--Ignatius and the Princess III(母函数)
2015-10-31 22:23
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Ignatius and the Princess III
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 16242 Accepted Submission(s): 11445
[align=left]Problem Description[/align]
"Well, it seems the first problem is too easy. I will let you know how foolish you are later." feng5166 says.
"The second problem is, given an positive integer N, we define an equation like this:
N=a[1]+a[2]+a[3]+...+a[m];
a[i]>0,1<=m<=N;
My question is how many different equations you can find for a given N.
For example, assume N is 4, we can find:
4 = 4;
4 = 3 + 1;
4 = 2 + 2;
4 = 2 + 1 + 1;
4 = 1 + 1 + 1 + 1;
so the result is 5 when N is 4. Note that "4 = 3 + 1" and "4 = 1 + 3" is the same in this problem. Now, you do it!"
[align=left]Input[/align]
The input contains several test cases. Each test case contains a positive integer N(1<=N<=120) which is mentioned above. The input is terminated by the end of file.
[align=left]Output[/align]
For each test case, you have to output a line contains an integer P which indicate the different equations you have found.
[align=left]Sample Input[/align]
4
10
20
[align=left]Sample Output[/align]
5
42
627
[align=left]Author[/align]
Ignatius.L
#include<stdio.h> #include<string.h> #define max 100+30 int main() { int c1[max],c2[max]; int n; while(scanf("%d",&n)!=EOF) { for(int i=0;i<=n;i++) { c1[i]=1; c2[i]=0; } for(int i=2;i<=n;i++)//从第二个多项式开始乘 { for(int j=0;j<=n;j++)//在第一个多项式中的每一项与后边的相乘 for(int k=0;k+j<=n;k+=i)//在第i个多项式中的每一项与前边的相乘 c2[k+j]+=c1[j]; for(int j=0;j<=n;j++) { c1[j]=c2[j];//更新现在第一个多项式中的每一项的系数 c2[j]=0; } } printf("%d\n",c1 ); } return 0; }
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