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166.java
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166.java
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__________________________________________________________________________________________________
sample 1 ms submission
class Solution {
public String fractionToDecimal(int numerator, int denominator) {
if (numerator == 0) return "0";
StringBuilder sb = new StringBuilder();
sb.append(((numerator > 0) ^ (denominator > 0)) ? "-" : "");
long num = (long) numerator;
long denom = (long) denominator;
num = Math.abs(num);
denom = Math.abs(denom);
sb.append(num / denom);
long rem = num % denom;
if (rem == 0) {
return sb.toString();
}
sb.append(".");
Map<Long, Integer> map = new HashMap<>();
StringBuilder tmp = new StringBuilder();
int pos = 0;
while (rem != 0) {
if (map.containsKey(rem)) {
tmp.insert(map.get(rem), "(");
tmp.append(")");
return sb.append(tmp).toString();
}
map.put(rem, pos);
tmp.append(10*rem/denom);
rem = 10 * rem % denom;;
pos++;
}
return sb.append(tmp).toString();
}
}
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sample 35300 kb submission
class Solution {
public String fractionToDecimal(int numerator, int denominator) {
if (numerator == 0) return "0";
StringBuilder answ = new StringBuilder();
if ((numerator>0&&denominator<0) || (numerator<0&&denominator>0)) answ.append("-");
long num = Math.abs((long) numerator);
long den = Math.abs((long) denominator);
answ.append(num/den);
num %= den;
if (num == 0) return answ.toString();
answ.append(".");
HashMap <Long, Integer> hsm = new HashMap <Long, Integer>();
hsm.put(num, answ.length());
while(num!=0){
num *= 10;
answ.append(num/den);
num %= den;
if (hsm.containsKey(num)){
int index = hsm.get(num);
answ.append(")");
answ.insert(index, "(");
break;
}else{
hsm.put(num, answ.length());
}
}
return answ.toString();
}
}
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