LeetCode 273 - Integer to English Words


https://leetcode.com/problems/integer-to-english-words/
Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1.
Example 1:
Input: 123
Output: "One Hundred Twenty Three"
Example 2:
Input: 12345
Output: "Twelve Thousand Three Hundred Forty Five"
Example 3:
Input: 1234567
Output: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"
Example 4:
Input: 1234567891
Output: "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"
https://github.com/mintycc/OnlineJudge-Solutions/blob/master/Leetcode/273_Integer_to_English_Words.java
2. -num也会overflow; array index should be int
考虑负数

    final static int[] POW10 = {1, 10, 100, 1000, 0, 0, 1000000, 0, 0, 1000000000};
    final static String[] ONES  = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
    final static String[] TENS = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
    
    public String numberToWords(int num) {
        if (num == 0) return "Zero";
        boolean negative = false;
        long n = num;
        if (num < 0) {
            negative = true;
            n = -n;
        }
        
        String rtn = helper(n);
        return negative ? "Negative " + rtn : rtn;
    }
    
    private String helper(long n) {
        String rtn = "";
        if (n < 20) rtn = ONES[(int)n];
        else if (n < POW10[2]) rtn = TENS[(int)n / POW10[1]] + " " + ONES[(int)n % POW10[1]];
        else if (n < POW10[3]) rtn = ONES[(int)n / POW10[2]] + " Hundred " + helper(n % POW10[2]);
        else if (n < POW10[6]) rtn = helper(n / POW10[3]) + " Thousand " + helper(n % POW10[3]);
        else if (n < POW10[9]) rtn = helper(n / POW10[6]) + " Million " + helper(n % POW10[6]);
        else rtn = helper(n / POW10[9]) + " Billion " + helper(n % POW10[9]);
        return rtn.trim();
    }


    final static String[] HUNDS = {"Hundred", "Thousand", "Million", "Billion"};
    final static String[] ONES  = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
    final static String[] TENS = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
    
    public String numberToWords(int num) {
        if (num == 0) return "Zero";
        
        boolean negative = false;
        long n = num;
        if (num < 0) {
            negative = true;
            n = -n;
        }
        
        List<String> ans = new ArrayList<String>();
        int cnt = -1;
        while (n > 0) {
            int hunds = (int)(n % 1000);
            n /= 1000; ++ cnt;
            if (hunds == 0) continue;
            if (cnt > 0) ans.add(HUNDS[cnt]);
            
            int tens = hunds % 100;
            if (tens > 0 && tens < 20) ans.add(ONES[tens]);
            else {
                if (tens % 10 > 0) ans.add(ONES[tens % 10]);
                if (tens / 10 > 0) ans.add(TENS[tens / 10]);
            }
            if (hunds / 100 > 0) {
                ans.add(HUNDS[0]);
                ans.add(ONES[hunds / 100]);
            }
        }
        
        if (negative) ans.add("Negative");
        Collections.reverse(ans);
        return String.join(" ", ans);
    }


http://blog.welkinlan.com/2015/09/29/integer-to-english-words-leetcode-java/
public class Solution {
private final String[] lessThan20 = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
private final String[] tens = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
private final String[] thousands = {"", "Thousand", "Million", "Billion"};
public String numberToWords(int num) {
if (num == 0) {
    return "Zero";
}
String result = "";
int i = 0;
while (num > 0) {
    if (num % 1000 != 0) {
        result = helper(num % 1000) + thousands[i] + " " + result;    
    }
    num /= 1000;
    i++;
}
return result.trim();
}
private String helper(int num) {
    if (num == 0) {
        return "";
    } else if (num < 20) {
        return lessThan20[num] + " ";
    } else if (num < 100) {
        return tens[num / 10] + " " + helper(num % 10);
    } else {
        return lessThan20[num / 100] + " Hundred " + helper(num % 100);
    }
}
}


https://www.bbsmax.com/A/D854p0w5Eg/
https://leetcode.com/problems/integer-to-english-words/discuss/70627/Short-clean-Java-solution
    private final String[] belowTen = new String[] {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
    private final String[] belowTwenty = new String[] {"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
    private final String[] belowHundred = new String[] {"", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
    
    public String numberToWords(int num) {
        if (num == 0) return "Zero";
        return helper(num); 
    }
    
    private String helper(int num) {
        String result = new String();
        if (num < 10) result = belowTen[num];
        else if (num < 20) result = belowTwenty[num -10];
        else if (num < 100) result = belowHundred[num/10] + " " + helper(num % 10);
        else if (num < 1000) result = helper(num/100) + " Hundred " +  helper(num % 100);
        else if (num < 1000000) result = helper(num/1000) + " Thousand " +  helper(num % 1000);
        else if (num < 1000000000) result = helper(num/1000000) + " Million " +  helper(num % 1000000);
        else result = helper(num/1000000000) + " Billion " + helper(num % 1000000000);
        return result.trim();
    }

X. Iterative
https://leetcode.com/problems/integer-to-english-words/discuss/70625/My-clean-Java-solution-very-easy-to-understand
private final String[] LESS_THAN_20 = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
private final String[] TENS = {"", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
private final String[] THOUSANDS = {"", "Thousand", "Million", "Billion"};

public String numberToWords(int num) {
    if (num == 0) return "Zero";

    int i = 0;
    String words = "";
    
    while (num > 0) {
        if (num % 1000 != 0)
         words = helper(num % 1000) +THOUSANDS[i] + " " + words;
     num /= 1000;
     i++;
    }
    
    return words.trim();
}

private String helper(int num) {
    if (num == 0)
        return "";
    else if (num < 20)
        return LESS_THAN_20[num] + " ";
    else if (num < 100)
        return TENS[num / 10] + " " + helper(num % 10);
    else
        return LESS_THAN_20[num / 100] + " Hundred " + helper(num % 100);
}
    String[] digit = {"", " One", " Two", " Three", " Four", " Five",
            " Six", " Seven", " Eight", " Nine"};
    String[] tenDigit = {" Ten", " Eleven", " Twelve", " Thirteen", " Fourteen", " Fifteen",
            " Sixteen", " Seventeen", " Eighteen", " Nineteen"};
    String[] tenMutipleDigit = {"", "", " Twenty", " Thirty", " Forty", " Fifty",

            " Sixty", " Seventy", " Eighty", " Ninety"};
public String numberToWords(int num) {
    String[] bigs = new String[]{" Thousand", " Million", " Billion"};
    StringBuilder sb = new StringBuilder();
    int i = 0;
    sb.append(convertToWords(num % 1000));
    num /= 1000; // no need to first preprocess
    while (num > 0) {
        if (num % 1000 != 0) {
            sb.insert(0, convertToWords(num % 1000) + bigs[i]);
        }
        i++;
        num /= 1000;
    }
    return sb.length() == 0 ? "Zero" : sb.toString().trim();
}
public String convertToWords(int num) { //rename to like: threeDigitToWords
    StringBuilder sb = new StringBuilder();
    if (num >= 100) {
        sb.append(digit[num / 100]).append(" Hundred");
        num %= 100;
    }
    if (num > 9 && num < 20) {
        sb.append(tenDigit[num - 10]);
    } else {
        if (num >= 20) {
            sb.append(tenMutipleDigit[num / 10]);
            num %= 10;
        }
        sb.append(digit[num]);
    }
    return sb.toString();
}

    string translate(vector<string> &ones,vector<string> &oneTens,vector<string> &tens,vector<string> &ends,int nums,string end) {
        string rt = "";
        if (nums >= 100) {
            rt += ones[nums / 100 - 1] + " Hundred";
            nums %= 100;
        }
         
        if (nums >= 10) {
            if (rt != "") rt += " ";
            if (nums <= 19) {
                rt += oneTens[nums % 10];
                return rt + end;
            }
            rt += tens[nums / 10 - 2];
            nums %= 10;
        }
         
        if (nums >= 1) {
            if (rt != "") rt += " ";
            rt += ones[nums - 1];
        }
         
        return rt + end;
    }
    string numberToWords(int num) {
        if (num == 0) return "Zero";
        vector<string> ones = {"One","Two","Three","Four","Five","Six","Seven","Eight","Nine"};
        vector<string> oneTens = {"Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Nineteen"};
        vector<string> tens = {"Twenty","Thirty","Forty","Fifty","Sixty","Seventy","Eighty","Ninety"};
        vector<string> ends = {" Billion"," Million"," Thousand",""};
         
        string rt = "";
        int temp = 0, endI = 0,bill = 1000000000;
        while (num > 0) {
            if (num / bill > 0) {
                if (rt != "") rt += " ";
                rt += translate(ones,oneTens,tens,ends,num / bill,ends[endI]);
            }
            num %= bill;
            bill /= 1000;
            endI++;
        }
        return rt;

    }
class Solution {
    unordered_map<int, string> hash;
public:
    Solution(){
        hash[0] = "Zero";
        hash[1] = "One";
        hash[2] = "Two";
        hash[3] = "Three";
        hash[4] = "Four";
        hash[5] = "Five";
        hash[6] = "Six";
        hash[7] = "Seven";
        hash[8] = "Eight";
        hash[9] = "Nine";
        hash[10] = "Ten";
        hash[11] = "Eleven";
        hash[12] = "Twelve";
        hash[13] = "Thirteen";
        hash[14] = "Fourteen";
        hash[15] = "Fifteen";
        hash[16] = "Sixteen";
        hash[17] = "Seventeen";
        hash[18] = "Eighteen";
        hash[19] = "Nineteen";
        hash[20] = "Twenty";
        hash[30] = "Thirty";
        hash[40] = "Forty";
        hash[50] = "Fifty";
        hash[60] = "Sixty";
        hash[70] = "Seventy";
        hash[80] = "Eighty";
        hash[90] = "Ninety";
    }
    string numberToWordsLessThousand(int num){
        if(!num) return hash[num];
        string s;
        if(num/100) s += hash[num/100] + " Hundred";
        num = num%100;
        if(num>=20){
            if(!s.empty()) s = s+" ";
            s += hash[num/10*10];
            num = num%10;
        }
        if(num){
            if(!s.empty()) s = s+" ";
            s += hash[num];
        }
        return s;
    }
    string numberToWords(int num) {
        if(!num) return hash[num];
        string s;
        if(num>=BILLION){
            int nb = num/BILLION;
            s += numberToWordsLessThousand(nb) + " Billion";
            num = num%BILLION;
        }
        if(num>=MILLION){
            if(!s.empty()) s = s+" ";
            int nm = num/MILLION;
            s += numberToWordsLessThousand(nm) + " Million";
            num = num%MILLION;
        }
        if(num>=THOUSAND){
            if(!s.empty()) s = s+" ";
            int nt = num/THOUSAND;
            s += numberToWordsLessThousand(nt) + " Thousand";
            num = num%THOUSAND;
        }
        if(num){
            if(!s.empty()) s = s+" ";
            s += numberToWordsLessThousand(num);
        }
        return s;
    }
};
http://likesky3.iteye.com/blog/2240465
  1.     public String numberToWords(int num) {  
  2.         if (num == 0) return "Zero";  
  3.         StringBuilder result = new StringBuilder();  
  4.         boolean hasBillion = false;  
  5.         boolean hasMillion = false;  
  6.         boolean hasThousand = false;  
  7.         if (num >= 1000000000) {  
  8.             hasBillion = true;  
  9.             result.append(digits[num / 1000000000]).append(' ').append("Billion").append(' ');  
  10.             num %= 1000000000;  
  11.         }  
  12.         if (num >= 1000000) {  
  13.             hasMillion = true;  
  14.             result.append(readALessThousandNum(String.valueOf(num / 1000000), false)).append(' ').append("Million").append(' ');  
  15.             num %= 1000000;  
  16.         } /*else if (hasBillion && num > 0) { 
  17.             result.append("and").append(' '); 
  18.         }*/  
  19.         if (num >= 1000) {  
  20.             hasThousand = true;  
  21.             result.append(readALessThousandNum(String.valueOf(num / 1000), false)).append(' ').append("Thousand").append(' ');  
  22.             num %= 1000;  
  23.         } /*else if (hasMillion && num > 0) { 
  24.             result.append("and").append(' '); 
  25.         }*/  
  26.         result.append(readALessThousandNum(String.valueOf(num), hasThousand));  
  27.         return result.toString().trim();  
  28.     }  
  29.     private String[] digits = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};  
  30.     private String[] tenx = {"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen",   
  31.         "Fifteen", "Sixteen", "Seventeen","Eighteen", "Nineteen"  
  32.     };  
  33.     private String[] tens = {"","","Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};  
  34.     public String readALessThousandNum(String num, boolean hasThousand) {  
  35.         if (num.length() == 1)  
  36.             num = "00" + num;  
  37.         else if (num.length() == 2)  
  38.             num = "0" + num;  
  39.         StringBuilder result = new StringBuilder();  
  40.         boolean hasHundred = false;  
  41.         if (num.charAt(0) != '0') {  
  42.             hasHundred = true;  
  43.             result.append(digits[num.charAt(0) - '0']).append(' ').append("Hundred").append(' ');  
  44.         } /*else if (hasThousand && (num.charAt(1) != '0'|| num.charAt(0) != '0')) { 
  45.             result.append("and"); 
  46.         }*/  
  47.         if (num.charAt(1) == '0' && num.charAt(2) != '0') {  
  48.             // if ((hasHundred || hasThousand))  
  49.             //     result.append("and").append(' ');  
  50.             result.append(digits[num.charAt(2) - '0']).append(' ');  
  51.         } else if (num.charAt(1) == '1') {  
  52.             // if (hasHundred || hasThousand)  
  53.             //     result.append("and").append(' ');  
  54.             result.append(tenx[num.charAt(2) - '0']).append(' ');  
  55.         } else {  
  56.             result.append(tens[num.charAt(1) - '0']).append(' ');  
  57.             if (num.charAt(2) != '0')  
  58.                 result.append(digits[num.charAt(2) - '0']).append(' ');  
  59.         }  
  60.         return result.toString().trim();  
  61.     }  
http://bookshadow.com/weblog/2015/08/31/leetcode-integer-english-words/
class Solution(object): def numberToWords(self, num): to19 = 'One Two Three Four Five Six Seven Eight Nine Ten Eleven Twelve ' \ 'Thirteen Fourteen Fifteen Sixteen Seventeen Eighteen Nineteen'.split() tens = 'Twenty Thirty Forty Fifty Sixty Seventy Eighty Ninety'.split() def words(n): if n < 20: return to19[n-1:n] if n < 100: return [tens[n/10-2]] + words(n%10) if n < 1000: return [to19[n/100-1]] + ['Hundred'] + words(n%100) for p, w in enumerate(('Thousand', 'Million', 'Billion'), 1): if n < 1000**(p+1): return words(n/1000**p) + [w] + words(n%1000**p) return ' '.join(words(num)) or 'Zero'

def numberToWords(self, num): lv1 = "Zero One Two Three Four Five Six Seven Eight Nine Ten \ Eleven Twelve Thirteen Fourteen Fifteen Sixteen Seventeen Eighteen Nineteen".split() lv2 = "Twenty Thirty Forty Fifty Sixty Seventy Eighty Ninety".split() lv3 = "Hundred" lv4 = "Thousand Million Billion".split() words, digits = [], 0 while num: token, num = num % 1000, num / 1000 word = '' if token > 99: word += lv1[token / 100] + ' ' + lv3 + ' ' token %= 100 if token > 19: word += lv2[token / 10 - 2] + ' ' token %= 10 if token > 0: word += lv1[token] + ' ' word = word.strip() if word: word += ' ' + lv4[digits - 1] if digits else '' words += word, digits += 1 return ' '.join(words[::-1]) or 'Zero'
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