Merge pull request #2693 from markwang1992/1049-lastStoneWeightII

1049.最后一块石头的重量II增加Go二维dp解法

problems/1049.最后一块石头的重量II.md

@@ -313,6 +313,8 @@ class Solution:
 
 ```
 ### Go：
+
+一维dp
 ```go
 func lastStoneWeightII(stones []int) int {
 	// 15001 = 30 * 1000 /2 +1
@@ -341,6 +343,43 @@ func max(a, b int) int {
 }
 ```
 
+二维dp
+```go
+func lastStoneWeightII(stones []int) int {
+    sum := 0
+    for _, val := range stones {
+        sum += val
+    }
+    target := sum / 2
+	
+    dp := make([][]int, len(stones))
+    for i := range dp {
+        dp[i] = make([]int, target + 1)
+    }
+    for j := stones[0]; j <= target; j++ {
+        dp[0][j] = stones[0]
+    }
+	
+    for i := 1; i < len(stones); i++ {
+        for j := 0; j <= target; j++ {
+            if stones[i] > j {
+                dp[i][j] = dp[i-1][j]
+            } else {
+                dp[i][j] = max(dp[i-1][j], dp[i-1][j-stones[i]] + stones[i])
+            }
+        }
+    }
+    return (sum - dp[len(stones)-1][target]) - dp[len(stones)-1][target]
+}
+
+func max(x, y int) int {
+    if x > y {
+        return x
+    }
+    return y
+}
+```
+
 ### JavaScript:
 
 ```javascript