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The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...
1
is read off as "one 1"
or 11
.11
is read off as "two 1s"
or 21
.21
is read off as "one 2
, then one 1"
or 1211
.
Given an integer n, generate the nth sequence.
Note: The sequence of integers will be represented as a string.
public class Solution {
public String countAndSay(int n) {
String result = "1";
StringBuilder next = new StringBuilder();
for (int i = 1; i < n; i++) {
int count = 1;
next.setLength(0);
for (int j = 1; j < result.length(); j++) {
if (result.charAt(j) != result.charAt(j-1)) {
next.append(count);
next.append(result.charAt(j - 1));
count = 1;
} else {
count ++;
}
}
next.append(count);
next.append(result.charAt(result.length() - 1));
result = next.toString();
}
return result;
}
}
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原文地址:http://www.cnblogs.com/shini/p/4553644.html