Add LC_maxnopartafterop class for partition operations

src/test/java/LeetCode/Maximize_the_Number_of_Partitions_After_Operations/LC_maxnopartafterop.java

@@ -0,0 +1,62 @@
+public class LC_maxnopartafterop {
+
+    public int maxPartitionsAfterOperations(String s, int k) {
+        int n = s.length();
+        int[][] left = new int[n][3];
+        int[][] right = new int[n][3];
+
+        int num = 0;
+        int mask = 0;
+        int count = 0;
+        for (int i = 0; i < n - 1; i++) {
+            int binary = 1 << (s.charAt(i) - 'a');
+            if ((mask & binary) == 0) {
+                count++;
+                if (count <= k) {
+                    mask |= binary;
+                } else {
+                    num++;
+                    mask = binary;
+                    count = 1;
+                }
+            }
+            left[i + 1][0] = num;
+            left[i + 1][1] = mask;
+            left[i + 1][2] = count;
+        }
+
+        num = 0;
+        mask = 0;
+        count = 0;
+        for (int i = n - 1; i > 0; i--) {
+            int binary = 1 << (s.charAt(i) - 'a');
+            if ((mask & binary) == 0) {
+                count++;
+                if (count <= k) {
+                    mask |= binary;
+                } else {
+                    num++;
+                    mask = binary;
+                    count = 1;
+                }
+            }
+            right[i - 1][0] = num;
+            right[i - 1][1] = mask;
+            right[i - 1][2] = count;
+        }
+
+        int maxVal = 0;
+        for (int i = 0; i < n; i++) {
+            int seg = left[i][0] + right[i][0] + 2;
+            int totMask = left[i][1] | right[i][1];
+            int totCount = Integer.bitCount(totMask);
+            if (left[i][2] == k && right[i][2] == k && totCount < 26) {
+                seg++;
+            } else if (Math.min(totCount + 1, 26) <= k) {
+                seg--;
+            }
+            maxVal = Math.max(maxVal, seg);
+        }
+        return maxVal;
+    }
+}