题解 P1021 【邮票面值设计】

· · 题解

int js(int t)
{
    int i,res;
    for (i=1; i<=1000; i++) b[i]=1000000000;
    for (i=1; i<=t; i++) b[a[i]]=1;
    res=0;
    do
    {
        res++;
        for (i=1; i<=t; i++)
            if (res>a[i] && b[res-a[i]]+1<b[res])
                b[res]=b[res-a[i]]+1;
    }while (b[res]<=m);
    return res;
}
void find(int i)
{
    int k,z;
    z=js(i-1);
    if (i>n)
    {
        int ii;
        if (z-1>ans)
        {
            ans=z-1;
            for (ii=2; ii<=n; ii++) s[ii]=a[ii];
        }

        return;
    }
    for (k=z; k>=a[i-1]+1; k--)
    {
        a[i]=k;
        find(i+1);  
    }
}
``````c
int main()
{
    int i;
    scanf("%d%d",&m,&n);
    a[1]=1;
    find(2);
    s[1]=1;
    for (i=1; i<=n; i++) printf ("%d ",s[i]);
    printf ("\n");
    printf("MAX=%d\n",ans);
    return 0;
}