Question

用Java，从键盘输入一个字符串，然后输出该字符加密后的结果。

加密算法：加密操作是将该字母按字母表顺序倒序。如A变成Z

Answer 1

Map<String, Integer> map1 = new HashMap<String, Integer>();
String[] a1 =
new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
for(int i=0;i<a1.length;i++){
map1.put(a1[i],i);
}
System.out.println(a1[a1.length-(map1.get("b")+1)]);

我用java写的 不明白再Q我吧 381363902

刚刚写了 map1.get("b") "b"就是你要输入的字符

要是输入多的话就循环呗

Answer 2

map先存好就行了。
例如
Map map=new HashMap();
map.put("a","z")
map.put("b","y");
.
.
.
.
map.put("z","a");

然后按照输入的直接从map里去就行了。
时间复杂度是线性的O（n）

Answer 3

MD5