feat: add rust solution to lc problem: No.0632 (#1935)

No.0632.Smallest Range Covering Elements from K Lists

Author: ifmagic

solution/0600-0699/0632.Smallest Range Covering Elements from K Lists/README.md

@@ -209,6 +209,49 @@ func smallestRange(nums [][]int) []int {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn smallest_range(nums: Vec<Vec<i32>>) -> Vec<i32> {
+        let mut t = vec![];
+        for (i, x) in nums.iter().enumerate() {
+            for &v in x {
+                t.push((v, i));
+            }
+        }
+        t.sort_unstable();
+        let (mut ans, n) = (vec![-1000000, 1000000], nums.len());
+        let mut j = 0;
+        let mut cnt = std::collections::HashMap::new();
+
+        for (b, v) in t.iter() {
+            let (b, v) = (*b, *v);
+            if let Some(x) = cnt.get_mut(&v) {
+                *x += 1;
+            } else {
+                cnt.insert(v, 1);
+            }
+            while cnt.len() == n {
+                let (a, w) = t[j];
+                let x = b - a - (ans[1] - ans[0]);
+                if x < 0 || (x == 0 && a < ans[0]) {
+                    ans = vec![a, b];
+                }
+                if let Some(x) = cnt.get_mut(&w) {
+                    *x -= 1;
+                }
+                if cnt[&w] == 0 {
+                    cnt.remove(&w);
+                }
+                j += 1;
+            }
+        }
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0600-0699/0632.Smallest Range Covering Elements from K Lists/README_EN.md

@@ -187,6 +187,49 @@ func smallestRange(nums [][]int) []int {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn smallest_range(nums: Vec<Vec<i32>>) -> Vec<i32> {
+        let mut t = vec![];
+        for (i, x) in nums.iter().enumerate() {
+            for &v in x {
+                t.push((v, i));
+            }
+        }
+        t.sort_unstable();
+        let (mut ans, n) = (vec![-1000000, 1000000], nums.len());
+        let mut j = 0;
+        let mut cnt = std::collections::HashMap::new();
+
+        for (b, v) in t.iter() {
+            let (b, v) = (*b, *v);
+            if let Some(x) = cnt.get_mut(&v) {
+                *x += 1;
+            } else {
+                cnt.insert(v, 1);
+            }
+            while cnt.len() == n {
+                let (a, w) = t[j];
+                let x = b - a - (ans[1] - ans[0]);
+                if x < 0 || (x == 0 && a < ans[0]) {
+                    ans = vec![a, b];
+                }
+                if let Some(x) = cnt.get_mut(&w) {
+                    *x -= 1;
+                }
+                if cnt[&w] == 0 {
+                    cnt.remove(&w);
+                }
+                j += 1;
+            }
+        }
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0600-0699/0632.Smallest Range Covering Elements from K Lists/Solution.rs

@@ -0,0 +1,38 @@
+impl Solution {
+    pub fn smallest_range(nums: Vec<Vec<i32>>) -> Vec<i32> {
+        let mut t = vec![];
+        for (i, x) in nums.iter().enumerate() {
+            for &v in x {
+                t.push((v, i));
+            }
+        }
+        t.sort_unstable();
+        let (mut ans, n) = (vec![-1000000, 1000000], nums.len());
+        let mut j = 0;
+        let mut cnt = std::collections::HashMap::new();
+
+        for (b, v) in t.iter() {
+            let (b, v) = (*b, *v);
+            if let Some(x) = cnt.get_mut(&v) {
+                *x += 1;
+            } else {
+                cnt.insert(v, 1);
+            }
+            while cnt.len() == n {
+                let (a, w) = t[j];
+                let x = b - a - (ans[1] - ans[0]);
+                if x < 0 || (x == 0 && a < ans[0]) {
+                    ans = vec![a, b];
+                }
+                if let Some(x) = cnt.get_mut(&w) {
+                    *x -= 1;
+                }
+                if cnt[&w] == 0 {
+                    cnt.remove(&w);
+                }
+                j += 1;
+            }
+        }
+        ans
+    }
+}