e100: Add rearrange chars

src/SUMMARY.md

@@ -391,6 +391,7 @@
     - [矩形相交的面积 - 数学](od/2024e100/area-of-intersected-rectangles/index.md)
     - [水仙花数I - 数学](od/2024e100/number-of-daffodil/index.md)
     - [不等式是否满足约束并输出最大差](od/2024e100/constraint-of-inequality/index.md)
+    - [字符统计及重排 - 字符串](od/2024e100/rearrange-chars/index.md)
     - [VLAN资源池](od/2024e100/vlan/index.md)
 - [OD 2024年E卷200分](od/2024e200/index.md)
     - [空栈压数](od/2024e200/push-numbers-into-stack/index.md)

src/od/2024e100/index.md

@@ -49,4 +49,5 @@
 47. [矩形相交的面积 - 数学](area-of-intersected-rectangles/index.md)
 48. [水仙花数I - 数学](number-of-daffodil/index.md)
 49. [不等式是否满足约束并输出最大差](constraint-of-inequality/index.md)
-50. [VLAN资源池](vlan/index.md)
+50. [字符统计及重排 - 字符串](rearrange-chars/index.md)
+51. [VLAN资源池](vlan/index.md)

src/od/2024e100/rearrange-chars/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "e100-rearrange-chars"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]

src/od/2024e100/rearrange-chars/assets/input1.txt

@@ -0,0 +1 @@
+xyxyXX

src/od/2024e100/rearrange-chars/assets/input2.txt

@@ -0,0 +1 @@
+abababb

src/od/2024e100/rearrange-chars/assets/output1.txt

@@ -0,0 +1 @@
+x:2;y:2;X:2;

src/od/2024e100/rearrange-chars/assets/output2.txt

@@ -0,0 +1 @@
+b:4;a:3;

src/od/2024e100/rearrange-chars/index.md

@@ -0,0 +1,51 @@
+# 字符统计及重排
+
+## 题目描述
+
+给出一个仅包含字母的字符串, 不包含空格, 统计字符串中各个字母（区分大小写）出现的次数,
+
+并按照字母出现次数从大到小的顺序. 输出各个字母及其出现次数.
+
+如果次数相同, 按照自然顺序进行排序, 且小写字母在大写字母之前.
+
+### 输入描述
+
+输入一行, 为一个仅包含字母的字符串.
+
+### 输出描述
+
+按照字母出现次数从大到小的顺序输出各个字母和字母次数, 用英文分号分隔, 注意末尾的分号.
+
+字母和次数间用英文冒号分隔.
+
+### 示例1
+
+输入:
+
+```text
+{{#include assets/input1.txt}}
+```
+
+输出:
+
+```text
+{{#include assets/output1.txt}}
+```
+
+### 示例2
+
+输入:
+
+```text
+{{#include assets/input2.txt}}
+```
+
+输出:
+
+```text
+{{#include assets/output2.txt}}
+```
+
+说明: b的出现个数比a多，故b排在a之前
+
+## 题解

src/od/2024e100/rearrange-chars/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}