You did offset to avoid negative weights, but you actually don't avoid wmax > 802.

For example, in test

10000 500
1 1 100
1 1 100
...
// p[i] = 1, w[i] = 1, d[i] = 100 for all items

You will have in process states with wmax = 500 + 300 + 99 and 500 + 300 + 99 * 2, but your dp has sizes 10002 x 802 x 3. It is not good because you have line in your code:

if(dp[pos][wmax][left] >= 0) return dp[pos][wmax][left];

So you need to change second dimension of dp to m + 2 * 300 or something about it.

P.S. Actually, this code with increasing of second dp dimension gives TL, because check

if(dp[pos][wmax][left] >= 0) return dp[pos][wmax][left];

doesn't return "-INF" results and process "-INF" states every time. You need to change this code to:

if(dp[pos][wmax][left] != -1) return dp[pos][wmax][left];

to process only "-1" states.