title: Count Natural Numbers Whose Permutation Greater Number
signature: class Solution {
  
      public Integer countNaturalNumbersWhosePermutationGreaterNumber(Integer n) {
source_py: def count_natural_numbers_whose_permutation_greater_number(n):
      result = 0
      for i in range(1, 10):
          s = []
          if (i <= n):
              s.append(i)
              result += 1
          while (len(s) != 0):
              tp = s[(- 1)]
              s.pop()
              for j in range((tp % 10), 10):
                  x = ((tp * 10) + j)
                  if (x <= n):
                      s.append(x)
                      result += 1
      return result
source_cpp: int count_natural_numbers_whose_permutation_greater_number(int n) {
    int result = 0;
    for ( int i = 1;
    i <= 9;
    i ++ ) {
      stack < int > s;
      if ( i <= n ) {
        s . push ( i );
        result ++;
      }
      while ( ! s . empty ( ) ) {
        int tp = s . top ( );
        s . pop ( );
        for ( int j = tp % 10;
        j <= 9;
        j ++ ) {
          int x = tp * 10 + j;
          if ( x <= n ) {
            s . push ( x );
            result ++;
          }
        }
      }
    }
    return result;
  }
question_info.extension: java
question_info.entry_fn_name: countNaturalNumbersWhosePermutationGreaterNumber
question_info.entry_cls_name: Solution
question_info.test_list: [{"idx": 0, "outputs": 48, "inputs": {"n": 69}}, {"idx": 1, "outputs": 48, "inputs": {"n": 72}}, {"idx": 2, "outputs": 52, "inputs": {"n": 88}}, {"idx": 3, "outputs": 7, "inputs": {"n": 7}}, {"idx": 4, "outputs": 45, "inputs": {"n": 66}}, {"idx": 5, "outputs": 28, "inputs": {"n": 34}}, {"idx": 6, "outputs": 20, "inputs": {"n": 23}}, {"idx": 7, "outputs": 31, "inputs": {"n": 37}}, {"idx": 8, "outputs": 27, "inputs": {"n": 33}}, {"idx": 9, "outputs": 18, "inputs": {"n": 21}}]
question_info.test_code: import static java.util.Map.entry;  
  import java.util.*;
  import java.lang.*;
  // TESTING CODE 
  // ============================================
  class QuestionEvaluator {
      public static String validateSolution(Integer n, Integer expected){
          try{
              Driver driver = new Driver();
              if (driver.run(n,expected)){
                  return "PASSED";
              }
              return "FAILED";
              
          } catch (Exception exception_obj){
              return exception_obj.getClass().getSimpleName();
          }
  
      }
      public static void main(String[] args) {
          String result;
          result = validateSolution(69, 48);
          System.out.println(String.format("%s%s","TEST-0...",result));    
      
          result = validateSolution(72, 48);
          System.out.println(String.format("%s%s","TEST-1...",result));    
      
          result = validateSolution(88, 52);
          System.out.println(String.format("%s%s","TEST-2...",result));    
      
          result = validateSolution(7, 7);
          System.out.println(String.format("%s%s","TEST-3...",result));    
      
          result = validateSolution(66, 45);
          System.out.println(String.format("%s%s","TEST-4...",result));    
      
          result = validateSolution(34, 28);
          System.out.println(String.format("%s%s","TEST-5...",result));    
      
          result = validateSolution(23, 20);
          System.out.println(String.format("%s%s","TEST-6...",result));    
      
          result = validateSolution(37, 31);
          System.out.println(String.format("%s%s","TEST-7...",result));    
      
          result = validateSolution(33, 27);
          System.out.println(String.format("%s%s","TEST-8...",result));    
      
          result = validateSolution(21, 18);
          System.out.println(String.format("%s%s","TEST-9...",result));    
      
      }
  }
  
  class Driver{
      public boolean run(Integer n, Integer expected){
  
          PLACEHOLDER_CLS_NAME sol = new PLACEHOLDER_CLS_NAME();
          return validateSolution(sol.PLACEHOLDER_FN_NAME(n),expected);
      }
      
      public boolean validateSolution(Integer actual, Integer expected){
          return actual.equals(expected);
      }
  }
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
question_info.test_case_ids: 0 1 2 3 4 5 6 7 8 9
question_info.commands: java __FILENAME__