POJ1745-Divisibility

http://poj.org/problem?id=1745

#include<stdio.h>
#include<string.h>
int a[10001],n,m;
bool dp[10001][101];
int main(void)
{
    int i,j,t1,t2;
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&a[i]);
        while(a[i]<0) 
           a[i]+=m;
        a[i]=a[i]%m;
    }
    dp[1][a[1]]=true;
    for(i=2;i<=n;i++)
    {
        for(j=0;j<m;j++)
        {
            t1=j-a[i];
            while(t1<0) 
               t1+=m;
            t2=j+a[i];
            dp[i][j]=dp[i-1][t1]||dp[i-1][t2%m];
        }
    }
    if(dp[n][0])
       printf("Divisible\n");
    else 
       printf("Not divisible\n");
    return 0;
}