poj 3181 Dollar Dayz

题意：农夫约翰有N元钱，市场上有价值1……K的商品无限个，求所有的花钱方案？

分析：完全背包+模拟大数，注意加前导0

#include<iostream>#include<cstdio>#include<cstring>using namespace std;#define MAXN 1005#define MAXM 105long long const MOD = 1e17;long long dp1[MAXN],dp2[MAXN];int main(){    int n,k;    while(scanf("%d%d",&n,&k) != EOF)    {        memset(dp1,0,sizeof(dp1));        memset(dp2,0,sizeof(dp2));        dp1[0] = 1;        for(int i = 1;i <= k;i++)            for(int j = i;j <= n;j++)            {                dp2[j] = (dp2[j] + dp2[j - i]) + (dp1[j] + dp1[j - i]) / MOD;                dp1[j] = (dp1[j] + dp1[j - i]) % MOD;            }        if(dp2[n])printf("%lld%012lld\n",dp2[n],dp1[n]);        else printf("%lld\n",dp1[n]);    }}