1305. Integer to English Words
class Solution {
public:
/**
* @param num: a non-negative integer
* @return: english words representation
*/
string numberToWords(int num) {
string res = convertHundred(num % 1000);
vector<string> v = {"Thousand", "Million", "Billion"};
for (int i = 0; i < 3; ++i) {
num /= 1000;
res = num % 1000 ? convertHundred(num % 1000) + " " + v[i] + " " + res : res;
}
while (res.back() == ' ') res.pop_back();
return res.empty() ? "Zero" : res;
}
string convertHundred(int num) {
vector<string> v1 = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
vector<string> v2 = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
string res;
int a = num / 100, b = num % 100, c = num % 10;
res = b < 20 ? v1[b] : v2[b / 10] + (c ? " " + v1[c] : "");
if (a > 0) res = v1[a] + " Hundred" + (b ? " " + res : "");
return res;
}
};
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