java: add “1422. Maximum Score After Splitting a String”

Signed-off-by: Matej Focko <me@mfocko.xyz>

java/maximum-score-after-splitting-a-string.java

@@ -0,0 +1,28 @@
+class Solution {
+    public int maxScore(String s) {
+        // count the ones
+        int ones = 0;
+        for (int i = 1; i < s.length(); ++i) {
+            if (s.charAt(i) == '1') {
+                ++ones;
+            }
+        }
+        int zeros = s.charAt(0) == '0' ? 1 : 0;
+
+        int foundScore = ones + zeros;
+        for (int i = 1; i < s.length() - 1; ++i) {
+            switch (s.charAt(i)) {
+                case '0':
+                    ++zeros;
+                    break;
+                case '1':
+                    --ones;
+                    break;
+            }
+
+            foundScore = Math.max(foundScore, ones + zeros);
+        }
+
+        return foundScore;
+    }
+}