Create 0740-delete-and-earn.java

Author: Tetsuya3850

Diff for: java/0740-delete-and-earn.java

@@ -0,0 +1,25 @@
+class Solution {
+    public int deleteAndEarn(int[] nums) {
+        Map<Integer, Integer> counter = new HashMap<>();
+        for (int i = 0; i < nums.length; i++) {
+            counter.put(nums[i], counter.getOrDefault(nums[i], 0) + 1);
+        }
+        List<Integer> numsList = new ArrayList<>(counter.keySet());
+        Collections.sort(numsList);
+
+        int earnOne = 0;
+        int earnTwo = 0;
+        for (int i = 0; i < numsList.size(); i++) {
+            int curEarn = numsList.get(i) * counter.get(numsList.get(i));
+            if (i > 0 && numsList.get(i) == numsList.get(i - 1) + 1) {
+                int temp = earnTwo;
+                earnTwo = Math.max(earnOne + curEarn, earnTwo);
+                earnOne = temp;
+            } else {
+                earnOne = earnTwo;
+                earnTwo += curEarn;
+            }
+        }
+        return earnTwo;
+    }
+}