38. Count and Say
public class Solution {
public String countAndSay(int n) {
StringBuilder curr=new StringBuilder("1");
StringBuilder prev;
int count;
char say;
for (int i=1;i<n;i++){
prev=curr;
curr=new StringBuilder();
count=1;
say=prev.charAt(0);
for (int j=1,len=prev.length();j<len;j++){
if (prev.charAt(j)!=say){
curr.append(count).append(say);
count=1;
say=prev.charAt(j);
}
else count++;
}
curr.append(count).append(say);
}
return
public String countAndSay(int n) {
StringBuilder curr=new StringBuilder("1");
StringBuilder prev;
int count;
char say;
for (int i=1;i<n;i++){
prev=curr;
curr=new StringBuilder();
count=1;
say=prev.charAt(0);
for (int j=1,len=prev.length();j<len;j++){
if (prev.charAt(j)!=say){
curr.append(count).append(say);
count=1;
say=prev.charAt(j);
}
else count++;
}
curr.append(count).append(say);
}
return
curr.toString();
}
}