Merge pull request #2730 from markwang1992/518-change

518.零钱兑换II增加Go二维dp解法

problems/0518.零钱兑换II.md

@@ -268,6 +268,7 @@ class Solution:
 
 ### Go：
 
+一维dp
 ```go
 func change(amount int, coins []int) int {
 	// 定义dp数组
@@ -286,6 +287,29 @@ func change(amount int, coins []int) int {
 	return dp[amount]
 }
 ```
+二维dp
+```go
+func change(amount int, coins []int) int {
+    dp := make([][]int, len(coins))
+    for i := range dp {
+        dp[i] = make([]int, amount + 1)
+        dp[i][0] = 1
+    }
+    for j := coins[0]; j <= amount; j++ {
+        dp[0][j] += dp[0][j-coins[0]]
+    }
+    for i := 1; i < len(coins); i++ {
+        for j := 1; j <= amount; j++ {
+            if j < coins[i] {
+                dp[i][j] = dp[i-1][j]
+            } else {
+                dp[i][j] = dp[i][j-coins[i]] + dp[i-1][j]
+            }
+        }
+    }
+    return dp[len(coins)-1][amount]
+}
+```
 
 ### Rust: