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62 lines (61 loc) · 1.33 KB
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AddBinary.java
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62 lines (61 loc) · 1.33 KB
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public class AddBinary {
public String addBinary(String a, String b) {
int la = a.length();
int lb = b.length();
if (la == 0) {
return b;
}
if (lb == 0) {
return a;
}
String temp;
if (la > lb) {
temp = b;
b = a;
a = temp;
}
la = a.length();
lb = b.length();
boolean carry = false;
StringBuilder sb = new StringBuilder();
int i = 0;
for (; i < lb; i++) {
char ca;
if (i >= la) {
ca = '0';
}
else {
ca = a.charAt(la - 1 - i);
}
char cb = b.charAt(lb - 1 - i);
if (carry) {
if (ca == '1' && cb == '1') {
sb.append('1');
}
else if (ca == '0' && cb == '0') {
sb.append('1');
carry = false;
}
else {
sb.append('0');
}
}
else {
if (ca == '1' && cb == '1') {
sb.append('0');
carry = true;
}
else if (ca == '0' && cb == '0') {
sb.append('0');
}
else {
sb.append('1');
}
}
}
if (carry) {
sb.append('1');
}
return sb.reverse().toString();
}
}