给定长度的二进制字符串，没有大小为 3 的回文
原文:https://www . geesforgeks . org/binary-string-给定长度-不带回文-size-3/
给定一个整数 n。找到一个由“a”和“b”组成的字符串，使该字符串不包含任何长度为 3 的回文。 例:
Input : 3
Output : "aab"
Explanation:
aab is not a palindrome.
Input : 5
Output : aabba
Explanation:
aabba does not contain a palindrome
of size 3.
这里的方法是，我们可以使用这个字符串' aabb '并根据给定的整数打印字符串的字符。
We need to make make sure that every third
character is different.
If we perform operation AND on i and 2 where
i = 0 to any positive integer. It will generate
a pattern 0, 0, 2, 2, 0, 0, 2, 2,...
0 AND 2 = 0
1 AND 2 = 0
2 AND 2 = 2
3 AND 2 = 2
4 AND 2 = 0 //repeat the pattern.
下面是上述方法的代码。
C++
// CPP program find a binary string of
// given length that doesn't contain
// a palindrome of size 3.
#include <bits/stdc++.h>
using namespace std;
void generatestring(int n)
{
// Printing the character according to i
for (int i = 0; i < n; i++)
putchar(i & 2 ? 'b' : 'a');
puts("");
}
// Driver code
int main()
{
int n = 5;
generatestring(n);
n = 8;
generatestring(n);
n = 10;
generatestring(n);
}
Java 语言(一种计算机语言，尤用于创建网站)
// JAVA program find a binary String of
// given length that doesn't contain
// a palindrome of size 3.
class GFG
{
static void generateString(int n)
{
String s = "";
// Printing the character according to i
for (int i = 0; i < n; i++)
s += ((i & 2) > 1 ? 'b' : 'a');
System.out.println(s);
}
// Driver code
public static void main(String[] args)
{
int n = 5;
generateString(n);
n = 8;
generateString(n);
n = 10;
generateString(n);
}
}
// This code is contributed by Rajput-Ji
Python 3
# Python3 program find a binary String of
# given length that doesn't contain
# a palindrome of size 3.
def generateString(n):
s = "";
# Printing the character according to i
for i in range(n):
if((i & 2) > 1):
s += 'b';
else:
s += 'a';
print(s);
# Driver code
if __name__ == '__main__':
n = 5;
generateString(n);
n = 8;
generateString(n);
n = 10;
generateString(n);
# This code is contributed by 29AjayKumar
C
// C# program find a binary String of
// given length that doesn't contain
// a palindrome of size 3.
using System;
class GFG
{
static void generateString(int n)
{
String s = "";
// Printing the character according to i
for (int i = 0; i < n; i++)
s += ((i & 2) > 1 ? 'b' : 'a');
Console.WriteLine(s);
}
// Driver code
public static void Main(String[] args)
{
int n = 5;
generateString(n);
n = 8;
generateString(n);
n = 10;
generateString(n);
}
}
// This code is contributed by Rajput-Ji
java 描述语言
<script>
// JavaScript program find a binary String of
// given length that doesn't contain
// a palindrome of size 3.
function generateString(n)
{
var s = "";
// Printing the character according to i
for (var i = 0; i < n; i++)
s += ((i & 2) > 1 ? 'b' : 'a');
document.write(s + "<br>");
}
// Driver code
var n = 5;
generateString(n);
n = 8;
generateString(n);
n = 10;
generateString(n);
</script>
输出:
aabba
aabbaabb
aabbaabbaa
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