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Copy pathadd-binary.java
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40 lines (34 loc) · 1010 Bytes
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Copy pathadd-binary.java
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40 lines (34 loc) · 1010 Bytes
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public class Solution {
public String addBinary(String a, String b) {
a = new StringBuffer(a).reverse().toString();
b = new StringBuffer(b).reverse().toString();
while (a.length() > b.length()) {
b += "0";
}
while (b.length() > a.length()) {
a += "0";
}
int carry = 0;
String answer = "";
for (int i = 0; i < a.length(); i++) {
int sum = a.charAt(i) - '0' + b.charAt(i) - '0' + carry;
if (sum == 0) {
answer += "0";
carry = 0;
} else if (sum == 1) {
answer += "1";
carry = 0;
} else if (sum == 2) {
answer += "0";
carry = 1;
} else {
answer += "1";
carry = 1;
}
}
if (carry == 1) {
answer += "1";
}
return new StringBuffer(answer).reverse().toString();
}
}