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38.count-and-say.java
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38.count-and-say.java
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/*
* @lc app=leetcode id=38 lang=java
*
* [38] Count and Say
*/
//小陷阱就是跑完循环之后记得把最后一个字符也加上,因为之前只是计数而已
class Solution {
static String countAndSay(int n) {
StringBuilder res = new StringBuilder();
if(n <= 0) {
res.append("Fuck");
}
else if(n == 1) {
res.append("1");
}
else {
//main program
String last = countAndSay(n-1);
char cur = last.charAt(0);
int count = 0;
for (int i = 0; i < last.length(); i++) {
if(cur == last.charAt(i)) {
count++;
}
else {
//res.concat(Integer.toString(count).concat(Character.toString(cur)));
res.append(count);
res.append(cur);
count = 1;
cur = last.charAt(i);
}
}
res.append(count);
res.append(cur);
}
//System.out.println(res);
return res.toString();
}
}