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https://leetcode.com/problems/fraction-addition-and-subtraction/description/
class Solution {
public:
int gcd(int a, int b)
{
return (b==0)? a:gcd(b, a%b);
}
string fractionAddition(string expression) {
istringstream is(expression);
int num = 0, dem = 0, A = 0, B = 1;
char c;
while (is>>num>>c>>dem) {
A = A*dem + num*B;
B *= dem;
int g = abs(gcd(A, B));
A /= g;
B /= g;
}
return to_string(A)+"/"+to_string(B);
}
};