Fraction to Recurring Decimal(STRING-TYPE CONVERTION)
2024-10-15 07:23:12
QUESTION
Given two integers representing the numerator and denominator of a fraction, return the fraction in string format.
If the fractional part is repeating, enclose the repeating part in parentheses.
For example,
Given numerator = 1, denominator = 2, return "0.5".
Given numerator = 2, denominator = 1, return "2".
Given numerator = 2, denominator = 3, return "0.(6)".
1ST TRY
class Solution {
public:
string fractionToDecimal(int numerator, int denominator) {
char* ch = new char();
string ret;
string fractionStr = "";
int remain;
vector<bool> flag(, false);
//integer part
*ch = numerator/denominator +'';
ret = ch;
//fraction part
while()
{
remain = numerator%denominator;
if(remain == ) return ret;
else if(flag[remain]) return ret + ".(" + fractionStr + ")";
else
{
flag[remain] = true;
*ch = numerator/denominator +'';
fractionStr += ch;
}
}
}
};
Result: Runtime Error
Last executed input: -50, 8
2ND TRY
考虑了负数情况
class Solution {
public:
string fractionToDecimal(int numerator, int denominator) {
string intStr = "";
string fractionStr = "";
string tmpStr = "";
int remain;
vector<bool> flag(, false);
// int 转 string
stringstream ss;
//negative or not
if(numerator > && denominator < )
{
intStr = "-";
denominator = ~(denominator-);
}
else if(numerator < && denominator > )
{
intStr = "-";
numerator = ~(numerator-);
}
else if(numerator < && denominator < )
{
numerator = ~(numerator-);
denominator = ~(denominator-);
}
//integer part
ss << numerator/denominator;
ss >> tmpStr;
intStr += tmpStr;
remain = numerator%denominator;
if(remain == ) return intStr;
//fraction part
while()
{
if(remain == ) return intStr + "." + fractionStr;
else if(flag[remain]) return intStr + ".(" + fractionStr + ")";
else
{
flag[remain] = true;
numerator = remain * ;
remain = numerator%denominator;
ss.clear();
ss << numerator/denominator;
ss >> tmpStr;
fractionStr += tmpStr;
}
}
}
};
Result: Runtime Error
Last executed input: -2147483648, -10
3RD TRY
考虑溢出的情况
class Solution {
public:
string fractionToDecimal(int numerator, int denominator) {
long long int num = (long long int) numerator;
long long int den = (long long int) denominator;
string intStr = "";
string fractionStr = "";
string tmpStr = "";
int remain;
set<int> flag;
// int 转 string
stringstream ss;
//negative or not
if(num > && denominator < )
{
intStr = "-";
den = ~(den-);
}
else if(num < && den > )
{
intStr = "-";
num = ~(num-);
}
else if(num < && den < )
{
num = ~(num-);
den = ~(den-);
}
//integer part
ss << num/den;
ss >> tmpStr;
intStr += tmpStr;
remain = num%den;
if(remain == ) return intStr;
//fraction part
while()
{
if(remain == ) return intStr + "." + fractionStr;
else if(flag.find(remain)!=flag.end()) return intStr + ".(" + fractionStr + ")";
else
{
flag.insert(remain);
num = remain * ;
remain = num%den;
ss.clear();
ss << num/den;
ss >> tmpStr;
fractionStr += tmpStr;
}
}
}
};
Result: Wrong
Input: 1, 6
Output: "0.(16)"
Expected: "0.1(6)"
4TH TRY
循环的位置得准确，所以用map代替set
class Solution {
public:
string fractionToDecimal(int numerator, int denominator) {
long long int num = (long long int) numerator;
long long int den = (long long int) denominator;
string ret = "";
string tmpStr = "";
int remain;
map<int,int> flag;
// int 转 string
stringstream ss;
//negative or not
if(num > && denominator < )
{
ret = "-";
den = ~(den-);
}
else if(num < && den > )
{
ret = "-";
num = ~(num-);
}
else if(num < && den < )
{
num = ~(num-);
den = ~(den-);
}
//integer part
ss << num/den;
ss >> tmpStr;
ret += tmpStr;
remain = num%den;
if(remain == ) return ret;
//fraction part
ret += ".";
while()
{
if(remain == ) return ret;
else if(flag.find(remain)!=flag.end())
{
ret.insert(flag[remain], , '(');
return ret + ")";
}
else
{
flag[remain] = ret.length();
num = remain * ;
remain = num%den;
ss.clear();
ss << num/den;
ss >> tmpStr;
ret += tmpStr;
}
}
}
};
Result: Wrong
Input: -1, -2147483648
Output: "0.000000000000000000000000000000-1"
Expected: "0.0000000004656612873077392578125"
5TH TRY
remain也要申请为long long int, 否则在num = remain * 10;会溢出
class Solution {
public:
string fractionToDecimal(int numerator, int denominator) {
long long int num = (long long int) numerator;
long long int den = (long long int) denominator;
string ret = "";
string tmpStr = "";
long long int remain;
map<int,int> flag;
// int 转 string
stringstream ss;
//negative or not
if(num > && denominator < )
{
ret = "-";
den = ~(den-);
}
else if(num < && den > )
{
ret = "-";
num = ~(num-);
}
else if(num < && den < )
{
num = ~(num-);
den = ~(den-);
}
//integer part
ss << num/den;
ss >> tmpStr;
ret += tmpStr;
remain = num%den;
if(remain == ) return ret;
//fraction part
ret += ".";
while()
{
if(remain == ) return ret;
else if(flag.find(remain)!=flag.end())
{
ret.insert(flag[remain], , '(');
return ret + ")";
}
else
{
flag[remain] = ret.length();
num = remain * ;
remain = num%den;
ss.clear();
ss << num/den;
ss >> tmpStr;
ret += tmpStr;
}
}
}
};
Result: Accepted
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