title: Length Longest Sub String Can Make Removed
signature: length_longest_sub_string_can_make_removed <- function(s) {
test_code: 
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  validate_solution <- function(actual, expected) {
      toString(actual)==toString(expected)
  }
  
  driver <- function(s, expected){
      if (validate_solution(PLACEHOLDER_FN_NAME(s), expected)){
          "PASSED"
      } else{
          "FAILED"
      }
  }
  
  main <- function() {
      cat(sprintf("TEST-0...%s\n",driver(
          "U", 
          0L
      )))
  
      cat(sprintf("TEST-1...%s\n",driver(
          "544", 
          0L
      )))
  
      cat(sprintf("TEST-2...%s\n",driver(
          "111", 
          0L
      )))
  
      cat(sprintf("TEST-3...%s\n",driver(
          " cDQaNxpRSOe", 
          0L
      )))
  
      cat(sprintf("TEST-4...%s\n",driver(
          "42920062459", 
          0L
      )))
  
      cat(sprintf("TEST-5...%s\n",driver(
          "00100101", 
          3L
      )))
  
      cat(sprintf("TEST-6...%s\n",driver(
          "FiC", 
          0L
      )))
  
      cat(sprintf("TEST-7...%s\n",driver(
          "302746335230", 
          0L
      )))
  
      cat(sprintf("TEST-8...%s\n",driver(
          "1", 
          0L
      )))
  
      cat(sprintf("TEST-9...%s\n",driver(
          "ZBLHiwGreUR ", 
          0L
      )))
  
  }
  
  main()
source_py: def length_longest_sub_string_can_make_removed(S):
      arr = []
      arr.append(['@', (- 1)])
      maxlen = 0
      for i in range(len(S)):
          arr.append([S[i], i])
          while ((len(arr) >= 3) and (arr[(len(arr) - 3)][0] == '1') and (arr[(len(arr) - 2)][0] == '0') and (arr[(len(arr) - 1)][0] == '0')):
              arr.pop()
              arr.pop()
              arr.pop()
          tmp = arr[(- 1)]
          maxlen = max(maxlen, (i - tmp[1]))
      return maxlen
source_cpp: int length_longest_sub_string_can_make_removed(string str) {
    vector < pair < char, int > > arr;
    arr . push_back ( {
      '@', - 1 }
      );
      int maxlen = 0;
      for ( int i = 0;
      i < str . length ( );
      ++ i ) {
        arr . push_back ( {
          str [ i ], i }
          );
          while ( arr . size ( ) >= 3 && arr [ arr . size ( ) - 3 ] . first == '1' && arr [ arr . size ( ) - 2 ] . first == '0' && arr [ arr . size ( ) - 1 ] . first == '0' ) {
            arr . pop_back ( );
            arr . pop_back ( );
            arr . pop_back ( );
          }
          int tmp = arr . back ( ) . second;
          maxlen = max ( maxlen, i - tmp );
        }
        return maxlen;
      }