add new solutions

solutions/14/q1458/solution.go

@@ -0,0 +1,38 @@
+package q1458
+
+import "math"
+
+func maxDotProduct(nums1 []int, nums2 []int) int {
+	board := make([][]int, len(nums1))
+	boardBuf := make([]int, len(nums1)*len(nums2))
+	for i := range board {
+		board[i] = boardBuf[i*len(nums2) : (i+1)*len(nums2)]
+	}
+	maxSingle := math.MinInt
+
+	for i1 := range nums1 {
+		for i2 := range nums2 {
+			prod := nums1[i1] * nums2[i2]
+			maxSingle = max(maxSingle, prod)
+
+			if i1 > 0 && i2 > 0 {
+				prod += board[i1-1][i2-1]
+			}
+			board[i1][i2] = max(0, prod)
+
+			if i2 > 0 {
+				board[i1][i2] = max(board[i1][i2-1], board[i1][i2])
+			}
+			if i1 > 0 {
+				board[i1][i2] = max(board[i1-1][i2], board[i1][i2])
+			}
+		}
+	}
+
+	if maxSingle <= 0 {
+		return maxSingle
+	}
+	return board[len(nums1)-1][len(nums2)-1]
+}
+
+var _ = maxDotProduct