添加 背包理论基础01背包-1.md Scala版本

problems/背包理论基础01背包-1.md

@@ -498,7 +498,41 @@ const size = 4;
 console.log(testWeightBagProblem(weight, value, size));
 ```
 
+### Scala
 
+```scala
+object Solution {
+  // 01背包
+  def test_2_wei_bag_problem1(): Unit = {
+    var weight = Array[Int](1, 3, 4)
+    var value = Array[Int](15, 20, 30)
+    var baseweight = 4
+
+    // 二维数组
+    var dp = Array.ofDim[Int](weight.length, baseweight + 1)
+
+    // 初始化
+    for (j <- weight(0) to baseweight) {
+      dp(0)(j) = value(0)
+    }
+
+    // 遍历
+    for (i <- 1 until weight.length; j <- 1 to baseweight) {
+      if (j - weight(i) >= 0) dp(i)(j) = dp(i - 1)(j - weight(i)) + value(i)
+      dp(i)(j) = math.max(dp(i)(j), dp(i - 1)(j))
+    }
+
+    // 打印数组
+    dp.foreach(x => println("[" + x.mkString(",") + "]"))
+
+    dp(weight.length - 1)(baseweight) // 最终返回
+  }
+
+  def main(args: Array[String]): Unit = {
+    test_2_wei_bag_problem1()
+  }
+}
+```
 
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