maxMirror.java

/*
We'll say that a "mirror" section in an array is a group of contiguous elements such that somewhere in the array, the same group appears in reverse order. For example, the largest mirror section in {1, 2, 3, 8, 9, 3, 2, 1} is length 3 (the {1, 2, 3} part). Return the size of the largest mirror section found in the given array.

maxMirror([1, 2, 3, 8, 9, 3, 2, 1]) → 3
maxMirror([1, 2, 1, 4]) → 3
maxMirror([7, 1, 2, 9, 7, 2, 1]) → 2
*/
public int maxMirror(int[] nums) {
  int max= 0;
  for(int i=0; i < nums.length; i++) {
    int count = 0;
    for(int j=nums.length-1; j >=0 && i+count < nums.length; j--) {
      if(nums[i+count] == nums[j]) {
        count++;
      }
      else {
        max = Math.max(max, count);
        count = 0;
      }
    }
    
  max = Math.max(max, count);
  }
  return max;
}