leetcode: Add search insert position

leetcode/0035.search-insert-position/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "lc-0035-search-insert-position"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]

leetcode/0035.search-insert-position/src/main.rs

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+// Copyright (c) 2023 Xu Shaohua <[email protected]>. All rights reserved.
+// Use of this source is governed by General Public License that can be
+// found in the LICENSE file.
+
+use std::cmp::Ordering;
+
+// Binary search
+pub fn search_insert(nums: Vec<i32>, target: i32) -> i32 {
+    assert!(!nums.is_empty());
+
+    let mut low = 0;
+    let mut high = nums.len() - 1;
+    while low + 1 < high {
+        let middle = low + (high - low) / 2;
+        match nums[middle].cmp(&target) {
+            Ordering::Less => low = middle,
+            Ordering::Equal => return middle as i32,
+            Ordering::Greater => high = middle,
+        }
+    }
+    if nums[high] < target {
+        high as i32 + 1
+    } else if nums[low] > target {
+        low as i32 - 1
+    } else {
+        high as i32
+    }
+}
+
+fn main() {
+    let nums = vec![1, 3, 5, 6];
+    let target = 5;
+    let pos = search_insert(nums, target);
+    assert_eq!(pos, 2);
+
+    let nums = vec![1, 3, 5, 6];
+    let target = 2;
+    let pos = search_insert(nums, target);
+    assert_eq!(pos, 1);
+
+    let nums = vec![1, 3, 5, 6];
+    let target = 7;
+    let pos = search_insert(nums, target);
+    assert_eq!(pos, 4);
+}