1331. 数组序号转换

src/main.rs

@@ -1,25 +1,32 @@
+use std::collections::HashMap;
+
 mod arr;
 struct Solution {}
 impl Solution {
-    pub fn number_of_special_chars(word: String) -> i32 {
-        let mut arr = vec![0;26];
-        for ch in word.chars() {
-            if ch as u8 >= 97 {
-                arr[ch as usize - 97] |= 1;
-            }else {
-                arr[ch as usize - 65] |= 2;
+    pub fn array_rank_transform(mut arr: Vec<i32>) -> Vec<i32> {
+        if arr.len() == 0 {
+            return arr;
         }
+        let mut sorted_arr = arr.clone();
+        sorted_arr.sort_unstable();
+        let mut mp = HashMap::with_capacity(arr.len());
+        let mut sub = 0;
+        mp.insert(sorted_arr[0], 0);
+        for i in 1..sorted_arr.len() {
+            if sorted_arr[i] == sorted_arr[i-1] {
+                sub+=1;
+                continue;
             }
-        let mut ans = 0;
-        for t in arr {
-            if t == 3 {
-                ans += 1;
+            mp.insert(sorted_arr[i], i as i32 - sub);
         }
+        println!("{:?}", mp);
+        for x in arr.iter_mut() {
+             *x = *mp.get(x).unwrap() + 1;
         }
-        ans
+        arr
     }
 }
 
 fn main() {
-    println!("{:?}", Solution::number_of_special_chars(String::from("aaAbcBC")));
+    println!("{:?}", Solution::array_rank_transform(vec![1,5,2,3,4,5]));
 }