static long countSubstr ( String s , int k ) {
  int n = s . length ( ) ;
  int l = n - 1 ;
  int r = n - 1 ;
  int [ ] arr = new int [ n ] ;
  int last_indexof1 = - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( s . charAt ( i ) == '1' ) {
      arr [ i ] = i ;
      last_indexof1 = i ;
    }
    else {
      arr [ i ] = last_indexof1 ;
    }
  }
  long no_of_substr = 0 ;
  for ( r = n - 1 ;
  r >= 0 ;
  r -- ) {
    l = r ;
    while ( l >= 0 && ( r - l + 1 ) <= 64 && Integer . valueOf ( s . substring ( l , r + 1 ) , 2 ) < k ) {
      l -- ;
    }
    if ( r - l + 1 <= 64 ) no_of_substr += l + 1 ;
    else {
      no_of_substr += arr [ l + 1 ] + 1 ;
    }
  }
  return no_of_substr ;
}

static long countSubstr ( String s , int k ) { int n = s . length ( ) ; int l = n - 1 ; int r = n - 1 ; int [ ] arr = new int [ n ] ; int last_indexof1 = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( s . charAt ( i ) == '1' ) { arr [ i ] = i ; last_indexof1 = i ; } else { arr [ i ] = last_indexof1 ; } } long no_of_substr = 0 ; for ( r = n - 1 ; r >= 0 ; r -- ) { l = r ; while ( l >= 0 && ( r - l + 1 ) <= 64 && Integer . valueOf ( s . substring ( l , r + 1 ) , 2 ) < k ) { l -- ; } if ( r - l + 1 <= 64 ) no_of_substr += l + 1 ; else { no_of_substr += arr [ l + 1 ] + 1 ; } } return no_of_substr ; }
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