Problem:
Given two strings representing two complex numbers.
You need to return a string representing their multiplication. Note i2 = -1 according to the definition.
Example 1:
Input: "1+1i", "1+1i"
Output: "0+2i"
Explanation: (1 + i) * (1 + i) = 1 + i2 + 2 * i = 2i, and you need convert it to the form of 0+2i.
Example 2:
Input: "1+-1i", "1+-1i"
Output: "0+-2i"
Explanation: (1 - i) * (1 - i) = 1 + i2 - 2 * i = -2i, and you need convert it to the form of 0+-2i.
Note:
- The input strings will not have extra blank.
- The input strings will be given in the form of a+bi, where the integer a and b will both belong to the range of [-100, 100]. And the output should be also in this form.
思路:
Solution (C++):
string complexNumberMultiply(string a, string b) {
int ra, ia, rb, ib;
char buff;
string res;
stringstream aa(a), bb(b);
aa >> ra >> buff >> ia >> buff;
bb >> rb >> buff >> ib >> buff;
res = to_string(ra*rb - ia*ib) + "+" + to_string(ra*ib+ia*rb) + "i";
return res;
}
性能:
Runtime: 0 ms Memory Usage: 5.9 MB
思路:
Solution (C++):
性能:
Runtime: ms Memory Usage: MB