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feat: add solutions to lc problem: No.0831
No.0831.Masking Personal Information
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‎solution/0800-0899/0831.Masking Personal Information/README.md

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Original file line numberDiff line numberDiff line change
@@ -121,22 +121,108 @@
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<!-- 这里可写通用的实现逻辑 -->
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**方法一：模拟**
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根据题目描述，我们可以先判断字符串 $s$ 是电子邮件还是电话号码，然后分别处理。
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时间复杂度为 $O(n)$，空间复杂度为 $O(n)$。其中 $n$ 为字符串 $s$ 的长度。
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<!-- tabs:start -->
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### **Python3**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```python
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class Solution:
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def maskPII(self, s: str) -> str:
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if s[0].isalpha():
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s = s.lower()
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return s[0] + '*****' + s[s.find('@') - 1:]
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s = ''.join(c for c in s if c.isdigit())
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cnt = len(s) - 10
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suf = '***-***-' + s[-4:]
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return suf if cnt == 0 else f'+{"*" * cnt}-{suf}'
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```
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### **Java**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```java
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class Solution {
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public String maskPII(String s) {
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if (Character.isLetter(s.charAt(0))) {
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s = s.toLowerCase();
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int i = s.indexOf('@');
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return s.substring(0, 1) + "*****" + s.substring(i - 1);
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}
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StringBuilder sb = new StringBuilder();
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for (char c : s.toCharArray()) {
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if (Character.isDigit(c)) {
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sb.append(c);
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}
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}
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s = sb.toString();
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int cnt = s.length() - 10;
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String suf = "***-***-" + s.substring(s.length() - 4);
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return cnt == 0 ? suf : "+" + "*".repeat(cnt) + "-" + suf;
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}
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}
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```
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### **C++**
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```cpp
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class Solution {
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public:
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string maskPII(string s) {
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int i = s.find('@');
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if (i != -1) {
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string ans;
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ans += tolower(s[0]);
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ans += "*****";
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for (int j = i - 1; j < s.size(); ++j) {
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ans += tolower(s[j]);
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}
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return ans;
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}
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string t;
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for (char c : s) {
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if (isdigit(c)) {
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t += c;
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}
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}
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int cnt = t.size() - 10;
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string suf = "***-***-" + t.substr(t.size() - 4);
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return cnt == 0 ? suf : "+" + string(cnt, '*') + "-" + suf;
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}
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};
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```
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### **Go**
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```go
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func maskPII(s string) string {
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i := strings.Index(s, "@")
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if i != -1 {
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s = strings.ToLower(s)
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return s[0:1] + "*****" + s[i-1:]
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}
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t := []rune{}
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for _, c := range s {
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if c >= '0' && c <= '9' {
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t = append(t, c)
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}
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}
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s = string(t)
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cnt := len(s) - 10
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suf := "***-***-" + s[len(s)-4:]
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if cnt == 0 {
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return suf
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}
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return "+" + strings.Repeat("*", cnt) + "-" + suf
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}
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```
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### **...**

‎solution/0800-0899/0831.Masking Personal Information/README_EN.md

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@@ -105,13 +105,93 @@ Thus, the resulting masked number is &quot;***-***-7890&quot;.
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### **Python3**
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```python
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class Solution:
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def maskPII(self, s: str) -> str:
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if s[0].isalpha():
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s = s.lower()
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return s[0] + '*****' + s[s.find('@') - 1:]
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s = ''.join(c for c in s if c.isdigit())
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cnt = len(s) - 10
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suf = '***-***-' + s[-4:]
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return suf if cnt == 0 else f'+{"*" * cnt}-{suf}'
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```
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### **Java**
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```java
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class Solution {
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public String maskPII(String s) {
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if (Character.isLetter(s.charAt(0))) {
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s = s.toLowerCase();
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int i = s.indexOf('@');
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return s.substring(0, 1) + "*****" + s.substring(i - 1);
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}
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StringBuilder sb = new StringBuilder();
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for (char c : s.toCharArray()) {
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if (Character.isDigit(c)) {
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sb.append(c);
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}
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}
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s = sb.toString();
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int cnt = s.length() - 10;
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String suf = "***-***-" + s.substring(s.length() - 4);
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return cnt == 0 ? suf : "+" + "*".repeat(cnt) + "-" + suf;
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}
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}
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```
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### **C++**
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```cpp
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class Solution {
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public:
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string maskPII(string s) {
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int i = s.find('@');
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if (i != -1) {
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string ans;
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ans += tolower(s[0]);
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ans += "*****";
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for (int j = i - 1; j < s.size(); ++j) {
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ans += tolower(s[j]);
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}
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return ans;
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}
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string t;
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for (char c : s) {
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if (isdigit(c)) {
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t += c;
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}
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}
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int cnt = t.size() - 10;
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string suf = "***-***-" + t.substr(t.size() - 4);
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return cnt == 0 ? suf : "+" + string(cnt, '*') + "-" + suf;
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}
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};
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```
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### **Go**
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```go
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func maskPII(s string) string {
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i := strings.Index(s, "@")
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if i != -1 {
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s = strings.ToLower(s)
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return s[0:1] + "*****" + s[i-1:]
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}
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t := []rune{}
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for _, c := range s {
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if c >= '0' && c <= '9' {
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t = append(t, c)
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}
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}
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s = string(t)
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cnt := len(s) - 10
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suf := "***-***-" + s[len(s)-4:]
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if cnt == 0 {
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return suf
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}
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return "+" + strings.Repeat("*", cnt) + "-" + suf
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}
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```
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### **...**

‎solution/0800-0899/0831.Masking Personal Information/Solution.cpp

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,24 @@
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class Solution {
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public:
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string maskPII(string s) {
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int i = s.find('@');
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if (i != -1) {
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string ans;
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ans += tolower(s[0]);
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ans += "*****";
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for (int j = i - 1; j < s.size(); ++j) {
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ans += tolower(s[j]);
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}
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return ans;
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}
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string t;
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for (char c : s) {
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if (isdigit(c)) {
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t += c;
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}
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}
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int cnt = t.size() - 10;
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string suf = "***-***-" + t.substr(t.size() - 4);
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return cnt == 0 ? suf : "+" + string(cnt, '*') + "-" + suf;
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}
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};

‎solution/0800-0899/0831.Masking Personal Information/Solution.go

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func maskPII(s string) string {
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i := strings.Index(s, "@")
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if i != -1 {
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s = strings.ToLower(s)
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return s[0:1] + "*****" + s[i-1:]
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}
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t := []rune{}
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for _, c := range s {
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if c >= '0' && c <= '9' {
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t = append(t, c)
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}
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}
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s = string(t)
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cnt := len(s) - 10
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suf := "***-***-" + s[len(s)-4:]
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if cnt == 0 {
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return suf
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}
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return "+" + strings.Repeat("*", cnt) + "-" + suf
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}

‎solution/0800-0899/0831.Masking Personal Information/Solution.java

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class Solution {
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public String maskPII(String s) {
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if (Character.isLetter(s.charAt(0))) {
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s = s.toLowerCase();
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int i = s.indexOf('@');
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return s.substring(0, 1) + "*****" + s.substring(i - 1);
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}
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StringBuilder sb = new StringBuilder();
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for (char c : s.toCharArray()) {
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if (Character.isDigit(c)) {
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sb.append(c);
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}
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}
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s = sb.toString();
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int cnt = s.length() - 10;
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String suf = "***-***-" + s.substring(s.length() - 4);
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return cnt == 0 ? suf : "+" + "*".repeat(cnt) + "-" + suf;
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}
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}

‎solution/0800-0899/0831.Masking Personal Information/Solution.py

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class Solution:
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def maskPII(self, s: str) -> str:
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if s[0].isalpha():
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s = s.lower()
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return s[0] + '*****' + s[s.find('@') - 1:]
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s = ''.join(c for c in s if c.isdigit())
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cnt = len(s) - 10
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suf = '***-***-' + s[-4:]
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return suf if cnt == 0 else f'+{"*" * cnt}-{suf}'

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