Add some code

leetcode/problems/java/minimum-swaps-to-group-all-1s-together-ii.java

@@ -0,0 +1,17 @@
+import java.util.Arrays;
+
+class Solution {
+  public int minSwaps(int[] nums) {
+    int k = Arrays.stream(nums).sum();
+    int n = nums.length;
+    int count = 0;
+    for (int i = 0; i < k; ++i)
+      count += nums[i];
+    int max = count;
+    for (int i = k; i < n + k; ++i) {
+      count += nums[i % n] - nums[(i - k + n) % n];
+      max = Math.max(max, count);
+    }
+    return k - max;
+  }
+}