Create Solution.java

Author: Jerring

solution/0560.Subarray Sum Equals K/Solution.java

@@ -0,0 +1,14 @@
+class Solution {
+    public int subarraySum(int[] nums, int k) {
+        Map<Integer, Integer> map = new HashMap<>();
+        map.put(0, 1);
+        int res = 0;
+        int s = 0;
+        for (int i = 0; i < nums.length; ++i) {
+            s += nums[i];
+            res += map.getOrDefault(s - k, 0);
+            map.put(s, map.getOrDefault(s, 0) + 1);
+        }
+        return res;
+    }
+}