diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md
index 459a66ad..6969c2e2 100644
--- a/problems/0001.两数之和.md
+++ b/problems/0001.两数之和.md
@@ -274,6 +274,30 @@ class Solution {
}
}
```
+
+Scala:
+```scala
+object Solution {
+ // 导入包
+ import scala.collection.mutable
+ def twoSum(nums: Array[Int], target: Int): Array[Int] = {
+ // key存储值,value存储下标
+ val map = new mutable.HashMap[Int, Int]()
+ for (i <- nums.indices) {
+ val tmp = target - nums(i) // 计算差值
+ // 如果这个差值存在于map,则说明找到了结果
+ if (map.contains(tmp)) {
+ return Array(map.get(tmp).get, i)
+ }
+ // 如果不包含把当前值与其下标放到map
+ map.put(nums(i), i)
+ }
+ // 如果没有找到直接返回一个空的数组,return关键字可以省略
+ new Array[Int](2)
+ }
+}
+```
+
C#:
```csharp
public class Solution {
@@ -293,5 +317,6 @@ public class Solution {
}
```
+
-----------------------
diff --git a/problems/0383.赎金信.md b/problems/0383.赎金信.md
index 933a7c31..75dafb72 100644
--- a/problems/0383.赎金信.md
+++ b/problems/0383.赎金信.md
@@ -363,6 +363,70 @@ impl Solution {
}
```
+Scala:
+
+版本一: 使用数组作为哈希表
+```scala
+object Solution {
+ def canConstruct(ransomNote: String, magazine: String): Boolean = {
+ // 如果magazine的长度小于ransomNote的长度,必然是false
+ if (magazine.length < ransomNote.length) {
+ return false
+ }
+ // 定义一个数组,存储magazine字符出现的次数
+ val map: Array[Int] = new Array[Int](26)
+ // 遍历magazine字符串,对应的字符+=1
+ for (i <- magazine.indices) {
+ map(magazine(i) - 'a') += 1
+ }
+ // 遍历ransomNote
+ for (i <- ransomNote.indices) {
+ if (map(ransomNote(i) - 'a') > 0)
+ map(ransomNote(i) - 'a') -= 1
+ else return false
+ }
+ // 如果上面没有返回false,直接返回true,关键字return可以省略
+ true
+ }
+}
+```
+
+```scala
+object Solution {
+ import scala.collection.mutable
+ def canConstruct(ransomNote: String, magazine: String): Boolean = {
+ // 如果magazine的长度小于ransomNote的长度,必然是false
+ if (magazine.length < ransomNote.length) {
+ return false
+ }
+ // 定义map,key是字符,value是字符出现的次数
+ val map = new mutable.HashMap[Char, Int]()
+ // 遍历magazine,把所有的字符都记录到map里面
+ for (i <- magazine.indices) {
+ val tmpChar = magazine(i)
+ // 如果map包含该字符,那么对应的value++,否则添加该字符
+ if (map.contains(tmpChar)) {
+ map.put(tmpChar, map.get(tmpChar).get + 1)
+ } else {
+ map.put(tmpChar, 1)
+ }
+ }
+ // 遍历ransomNote
+ for (i <- ransomNote.indices) {
+ val tmpChar = ransomNote(i)
+ // 如果map包含并且该字符的value大于0,则匹配成功,map对应的--,否则直接返回false
+ if (map.contains(tmpChar) && map.get(tmpChar).get > 0) {
+ map.put(tmpChar, map.get(tmpChar).get - 1)
+ } else {
+ return false
+ }
+ }
+ // 如果上面没有返回false,直接返回true,关键字return可以省略
+ true
+ }
+}
+
+
C#:
```csharp
public bool CanConstruct(string ransomNote, string magazine) {
@@ -379,6 +443,7 @@ public bool CanConstruct(string ransomNote, string magazine) {
}
return true;
}
+
```
-----------------------
diff --git a/problems/0454.四数相加II.md b/problems/0454.四数相加II.md
index 962fe7a5..bfdee26e 100644
--- a/problems/0454.四数相加II.md
+++ b/problems/0454.四数相加II.md
@@ -318,6 +318,43 @@ impl Solution {
}
```
+
+Scala:
+```scala
+object Solution {
+ // 导包
+ import scala.collection.mutable
+ def fourSumCount(nums1: Array[Int], nums2: Array[Int], nums3: Array[Int], nums4: Array[Int]): Int = {
+ // 定义一个HashMap,key存储值,value存储该值出现的次数
+ val map = new mutable.HashMap[Int, Int]()
+ // 遍历前两个数组,把他们所有可能的情况都记录到map
+ for (i <- nums1.indices) {
+ for (j <- nums2.indices) {
+ val tmp = nums1(i) + nums2(j)
+ // 如果包含该值,则对他的key加1,不包含则添加进去
+ if (map.contains(tmp)) {
+ map.put(tmp, map.get(tmp).get + 1)
+ } else {
+ map.put(tmp, 1)
+ }
+ }
+ }
+ var res = 0 // 结果变量
+ // 遍历后两个数组
+ for (i <- nums3.indices) {
+ for (j <- nums4.indices) {
+ val tmp = -(nums3(i) + nums4(j))
+ // 如果map中存在该值,结果就+=value
+ if (map.contains(tmp)) {
+ res += map.get(tmp).get
+ }
+ }
+ }
+ // 返回最终结果,可以省略关键字return
+ res
+ }
+}
+
C#:
```csharp
public int FourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4) {