Ignatius and the Princess III
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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): 15659 Accepted Submission(s): 11038
Problem Description
"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!"
"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!"
Input
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.
Output
For each test case, you have to output a line contains an integer P which indicate the different equations you have found.
Sample Input
41020
Sample Output
542627
Author
Ignatius.L
完全背包问题。把总和的那个数n看作是背包总容量。材料有1,2……n,这些材料向背包填充。最大价值对应的是最多方案。
#include<iostream>#include<stdio.h>#include<string.h>using namespace std;int main(){ int n,i,j,a[150],dp[150]; while(scanf("%d",&n)!=EOF) { memset(dp,0,sizeof(dp)); dp[0]=1; for(i=1;i<=n;i++) a[i]=i;//材料容量 for(i=1;i<=n;i++) { for(j=a[i];j<=n;j++) { dp[j]+=dp[j-a[i]]; } } cout<<dp[n]<<endl; } return 0;}
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