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Solution.cs

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public class Solution

{

public int MaxDotProduct(int[] nums1, int[] nums2)

{

return DP(0, 0, nums1, nums2);

}

Dictionary<(int, int), int> memo = [];

int DP(int p1, int p2, int[] nums1, int[] nums2)

{

int n1 = nums1.Length, n2 = nums2.Length;

if (p1 >= n1 || p2 >= n2) return int.MinValue / 2;

var key = (p1, p2);

if (memo.TryGetValue(key, out int cache)) return cache;

int ans = int.MinValue;

ans = Math.Max(ans, DP(p1 + 1, p2, nums1, nums2));

ans = Math.Max(ans, DP(p1, p2 + 1, nums1, nums2));

ans = Math.Max(ans, nums1[p1] * nums2[p2] + Math.Max(0, DP(p1 + 1, p2 + 1, nums1, nums2)));

return memo[key] = ans;

}

}