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Re:这题用dfs没戏,保准超时,只能dp或者滑动数组In Reply To:这题用dfs没戏,保准超时,只能dp或者滑动数组 Posted by:Hins at 2010-01-11 15:53:18 谁说的啊,我DFS 300MS 过的
#include<iostream>
using namespace std;
int num[10001];
bool f[10001][101],flag;
int k,n;
bool dfs(int i,int sum)
{
if(i==n)
{
if(sum%k==0)
{
flag=1;
return 1;
}
else return 0;
}
if(!f[i][sum])
{
f[i][sum]=1;
dfs(i+1,(sum+num[i+1])%k);
dfs(i+1,(k+sum-num[i+1])%k);
}
return flag;
}
int main()
{
freopen("in.txt","r",stdin);
int i,a;
scanf("%d%d",&n,&k);
for(i=1;i<=n;i++)
{
scanf("%d",&a);
num[i]=a%k;
}
if(dfs(1,num[1]))
printf("Divisible\n");
else
printf("Not divisible\n");
return 0;
}
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