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537.java
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537.java
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public class Solution {
class Complex {
int a ;
int b ;
public Complex(int aa, int bb) {
a = aa;
b = bb;
}
public Complex(String n) {
int sign = 1;
Integer cur = null;
for(int i = 0; i< n.length(); ++i) {
if(n.charAt(i) == '-') {
sign = -1;
} else if(n.charAt(i) == '+') {
if(cur == null) continue;
a = sign * cur;
sign = 1;
cur = null;
} else if(n.charAt(i) == 'i') {
b = sign * cur;
break;
} else if(n.charAt(i) >= '0' && n.charAt(i)<='9') {
if(cur == null ) cur = n.charAt(i) - '0';
else cur = cur * 10 + n.charAt(i) - '0';
}
}
}
public String getVal() {
StringBuilder sb = new StringBuilder();
sb.append(a);
sb.append('+');
sb.append(b);
sb.append('i');
return sb.toString();
}
public Complex mul(Complex c) {
return new Complex(c.a * a - c.b * b, a * c.b + b * c.a);
}
}
public String complexNumberMultiply(String a, String b) {
Complex c1 = new Complex(a);
Complex c2 = new Complex(b);
return c1.mul(c2).getVal();
}
}