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| public class Solution {
public String addBinary(String a, String b) {
int len1 = a.length();
int len2 = b.length();
int delta = Math.abs(len1 - len2);
int max = Math.max(len1, len2);
int[] intVal1 = new int[max];
int[] intVal2 = new int[max];
if(len1 >= len2){
for(int i = 0; i < max; i++){
intVal1[i] = Integer.parseInt(String.valueOf(a.charAt(i)));
}
for(int j = 0; j < max; j++){
if(j < delta){
intVal2[j] = 0;
} else {
intVal2[j] = Integer.parseInt(String.valueOf(b.charAt(j - delta)));
}
}
} else {
for(int i = 0; i < max; i++){
intVal1[i] = Integer.parseInt(String.valueOf(b.charAt(i)));
}
for(int j = 0; j < max; j++){
if(j < delta){
intVal2[j] = 0;
} else {
intVal2[j] = Integer.parseInt(String.valueOf(a.charAt(j - delta)));
}
}
}
StringBuilder builder = new StringBuilder("");
handle(max, 0, intVal1, intVal2, builder);
return builder.reverse().toString();
}
private static void handle(int max, int more, int[] val1, int[] val2, StringBuilder builder){
int temp = 0;
if(max >= 1){
temp = val1[max - 1] + val2[max - 1] + more;
} else {
temp = val1[0] + val2[0] + more;
}
if(max-1 > 0){
if(temp <= 1){
builder.append(Integer.toString(temp));
handle(--max, 0, val1, val2, builder);
} else {
builder.append(Integer.toString(temp % 2));
handle(--max, 1, val1, val2, builder);
}
} else {
if(temp <= 1){
builder.append(Integer.toString(temp));
} else {
builder.append(Integer.toString(temp % 2));
builder.append("1");
}
}
}
}
|
