hdu 1085 母函数

Input
Input contains multiple test cases. Each test case contains 3 positive integers num_1, num_2 and num_5 (0<=num_i<=1000). A test case containing 0 0 0 terminates the input and this test case is not to be processed.

Output
Output the minimum positive value that one cannot pay with given coins, one line for one case.

Sample Input
1 1 3
0 0 0

Sample Output
4

题解：

给定1，2，5硬币个数，问最小组成的硬币总数是多少？
母函数模板

代码：

#include <bits/stdc++.h>using namespace std;int v[3]={1,2,5};int n[3],a[9000],b[9000],i,j,k,last,last2;int main(){while(cin>>n[0]>>n[1]>>n[2]&&(n[0]+n[1]+n[2])){     a[0]=1;      last=0;     for (int i=0;i<3;i++)    {      last2=last+n[i]*v[i];      memset(b,0,sizeof(int)*(last2+1));      for (j=0;j<=n[i]&&j*v[i]<=last2;j++)        for (k=0;k<=last&&k+j*v[i]<=last2;k++)        b[k+j*v[i]]+=a[k];        memcpy(a,b,sizeof(int)*(last2+1));        last=last2;    }    for(i=0;i<=last;i++)        if(a[i]==0)           break;    cout<<i<<endl;}    return 0;}