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}