title: Print Maximum Shortest Distance
signature: class Solution {
  
      public Long printMaximumShortestDistance(ArrayList<Integer> a, Integer n, Integer k) {
test_code: import static java.util.Map.entry;  
  import java.util.*;
  import java.lang.*;
  // TESTING CODE 
  // ============================================
  class QuestionEvaluator {
      public static String validateSolution(ArrayList<Integer> a, Integer n, Integer k, Long expected){
          try{
              Driver driver = new Driver();
              if (driver.run(a, n, k,expected)){
                  return "PASSED";
              }
              return "FAILED";
              
          } catch (Exception exception_obj){
              return exception_obj.getClass().getSimpleName();
          }
  
      }
      public static void main(String[] args) {
          String result;
          result = validateSolution(new ArrayList<>(Arrays.asList(2, 27, 66, 89, 96, 96)), 4, 4, 1000000000L);
          System.out.println(String.format("%s%s","TEST-0...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(84, -38, -56, -20, -98, -40, -16, 22, 20, 98, -56, -32, -44, 30, -58, 26, -44, -32, 50, 46, 92)), 13, 11, 1000000000L);
          System.out.println(String.format("%s%s","TEST-1...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1)), 23, 13, 1000000000L);
          System.out.println(String.format("%s%s","TEST-2...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(20, 71, 66, 58, 74, 2, 63, 13, 1, 36, 28, 83, 24, 20, 85, 30, 59, 56, 8, 97, 58, 28, 28, 42)), 23, 17, 1000000000L);
          System.out.println(String.format("%s%s","TEST-3...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(-94, -88, -86, -68, -66, -64, -28, -12, 4, 18, 22, 28, 32, 34, 34, 40, 44, 46, 60, 68, 72, 78, 80, 84, 88, 96)), 16, 15, 1000000000L);
          System.out.println(String.format("%s%s","TEST-4...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1)), 8, 13, 1000000000L);
          System.out.println(String.format("%s%s","TEST-5...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(8, 13, 54, 59, 61, 69, 89, 90, 92)), 4, 8, 1000000000L);
          System.out.println(String.format("%s%s","TEST-6...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(-58, 50, -74, -8, -50, 90, 90, -2, -22, 8, -76, 16, 4, 56, 94, 36, 28, -42, 80, -88, 88, 52, 74, 40, 12, -72, -50, 50, 88, -54, 32, -24, -48, -66, -86, 40, -6, 14, 10, -88, 56, 80, -34)), 27, 42, 4L);
          System.out.println(String.format("%s%s","TEST-7...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1)), 9, 12, 1000000000L);
          System.out.println(String.format("%s%s","TEST-8...",result));    
      
          result = validateSolution(new ArrayList<>(Arrays.asList(2, 60, 66, 39, 18, 60, 37, 75, 3, 64, 24, 16, 72, 95, 96, 44, 23, 58, 58, 33, 24, 96)), 21, 17, 1000000000L);
          System.out.println(String.format("%s%s","TEST-9...",result));    
      
      }
  }
  
  class Driver{
      public boolean run(ArrayList<Integer> a, Integer n, Integer k, Long expected){
  
          PLACEHOLDER_CLS_NAME sol = new PLACEHOLDER_CLS_NAME();
          return validateSolution(sol.PLACEHOLDER_FN_NAME(a, n, k),expected);
      }
      
      public boolean validateSolution(Long actual, Long expected){
          return actual.equals(expected);
      }
  }
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
source_py: def print_maximum_shortest_distance(a, n, k):
      b = dict()
      for i in range(n):
          x = a[i]
          d = min((1 + i), (n - i))
          if (x not in b.keys()):
              b[x] = d
          else:
              b[x] = min(d, b[x])
      ans = (10 ** 9)
      for i in range(n):
          x = a[i]
          if ((x != (k - x)) and ((k - x) in b.keys())):
              ans = min(max(b[x], b[(k - x)]), ans)
      return ans
source_cpp: int print_maximum_shortest_distance(vector<int> a, int n, int k) {
    unordered_map < int, int > b;
    for ( int i = 0;
    i < n;
    i ++ ) {
      int x = a [ i ];
      int d = min ( 1 + i, n - i );
      if ( b . find ( x ) == b . end ( ) ) b [ x ] = d;
      else b [ x ] = min ( d, b [ x ] );
    }
    int ans = INT_MAX;
    for ( int i = 0;
    i < n;
    i ++ ) {
      int x = a [ i ];
      if ( x != k - x && b . find ( k - x ) != b . end ( ) ) ans = min ( max ( b [ x ], b [ k - x ] ), ans );
    }
    return ans;
  }