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leetcode166.java
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leetcode166.java
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public class Solution {
public String fractionToDecimal(int numerator, int denominator) {
if(numerator == 0){
return "0";
}
StringBuilder sb = new StringBuilder();
String sign;
if(numerator < 0 == denominator < 0){
sign = "";
}
else{
sign = "-";
}
sb.append(sign);
long num = Math.abs((long)numerator);
long den = Math.abs((long)denominator);
sb.append(num / den);
num %= den;
if(num == 0){
return sb.toString();
}
sb.append(".");
HashMap<Long, Integer> map = new HashMap<Long, Integer>();
map.put(num, sb.length());
while(num != 0){
num*=10;
sb.append(num/den);
num %= den;
Integer remainderIndex = map.get(num);
if(remainderIndex != null){
sb.insert(remainderIndex,"(");
sb.append(")");
break;
}
else{
map.put(num,sb.length());
}
}
return sb.toString();
}
}