hdu 1085 Holding Bin-Laden Captive! (母函数)

http://acm.hdu.edu.cn/showproblem.php?pid=1085 题意;一元的钱有num_1张,2元的钱有num_2张,5元的钱有num_5张,问最小的不能组成的钱是多少。 思路:有限个个数的母函数,并且不知道最好要多少,所以限制条件变成了不同种类钱的个数。统计0到num_1+2num_2+5num_5的方案数,第一个为0的就是答案。

20161117更新:之前贴的代码好像有点问题…估计是最后一次更新以后忘记保存了orz

 1/* ***********************************************
 2Author :111qqz
 3Created Time :2016年02月25日 星期四 22时26分16秒
 4File Name :code/hdu.1085.cpp
 5************************************************ */
 6
 7#include <cstdio>
 8#include <cstring>
 9#include <iostream>
10#include <algorithm>
11#include <vector>
12#include <queue>
13#include <set>
14#include <map>
15#include <string>
16#include <cmath>
17#include <cstdlib>
18#include <ctime>
19#define fst first
20#define sec second
21#define lson l,m,rt<<1
22#define rson m+1,r,rt<<1|1
23#define ms(a,x) memset(a,x,sizeof(a))
24typedef long long LL;
25#define pi pair < int ,int >
26#define MP make_pair
27
28using namespace std;
29const double eps = 1E-8;
30const int dx4[4]={1,0,0,-1};
31const int dy4[4]={0,-1,1,0};
32const int inf = 0x3f3f3f3f;
33const int N=9E3+7;
34int num_1,num_2,num_5;
35int a[N],tmp[N];
36int main()
37{
38    #ifndef  ONLINE_JUDGE 
39    freopen("code/in.txt","r",stdin);
40  #endif
41
42    while (~scanf("%d%d%d",&num_1,&num_2,&num_5))
43    {
44        if (num_1==0&&num_2==0&&num_5==0) break; 
45        ms(a,0);
46        int total = num_1+2*num_2+5*num_5;
47        for ( int i = 0 ; i <= num_1; i++)
48        {
49        a[i] = 1;
50        tmp[i] = 0;
51        }
52
53        for ( int j = 0 ; j <= num_1 ; j++)
54        {
55        for ( int k =  0; k <=num_2 ; k++)
56        {
57            tmp[j+2*k] += a[j];
58        }
59        }
60
61        for ( int j = 0 ; j <= num_1 +2*num_2 ; j++)
62        {
63        a[j] = tmp[j];
64        tmp[j] = 0 ;
65        }
66
67        for ( int j = 0 ; j <= num_1+2*num_2 ; j++)
68        {
69        for ( int k =  0;  k <= num_5 ; k++)
70        {
71            tmp[j+5*k]+=a[j];
72        }
73        }
74        for ( int j = 0 ; j <= total ; j++)
75        {
76        a[j] = tmp[j];
77        tmp[j] =  0 ;
78        }
79
80        for ( int i = 0 ; i <= total +1 ; i ++)
81        {
82        if (a[i]==0)
83        {
84            printf("%d\n",i);
85            break;
86        }
87        }
88    }
89
90  #ifndef ONLINE_JUDGE  
91  fclose(stdin);
92  #endif
93    return 0;
94}