leetcode: Add 0739

src/SUMMARY.md

@@ -15,6 +15,7 @@
     - [跳跃表 SkipList](list/skiplist/index.md)
     - [链表相关的问题列表](leetcode/tags/linked-list.md)
 - [栈 Stack](stack/index.md)
+    - [单调栈 Monotonic Stack](stack/monotonic-stack.md)
     - [栈相关的问题列表](leetcode/tags/stack.md)
 - [队列 Queue](queue/index.md)
 - [优先级队列 Priority Queue](priority-queue/index.md)

src/leetcode/0739.daily-temperatures/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "lc-0739-daily-temperatures"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]

src/leetcode/0739.daily-temperatures/index.md

@@ -0,0 +1,4 @@
+
+# 
+
+[问题描述](../problems/)

src/leetcode/0739.daily-temperatures/src/main.rs

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+// Copyright (c) 2024 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.
+
+// Brute force
+pub fn daily_temperatures1(temperatures: Vec<i32>) -> Vec<i32> {
+    assert!(!temperatures.is_empty());
+
+    let mut out = Vec::new();
+    let len = temperatures.len();
+    for i in 0..len {
+        let mut diff = 0;
+        for j in i..len {
+            if temperatures[j] > temperatures[i] {
+                diff = j - i;
+                break;
+            }
+        }
+        out.push(diff as i32);
+    }
+    out
+}
+
+// Stack
+// 单调递增栈
+pub fn daily_temperatures2(temperatures: Vec<i32>) -> Vec<i32> {
+    assert!(!temperatures.is_empty());
+
+    let len = temperatures.len();
+    let mut out = vec![0; len];
+    // 存储温度值所在数组的下标
+    let mut stack: Vec<usize> = Vec::new();
+
+    // 遍历数组
+    for (index, &num) in temperatures.iter().enumerate() {
+        // 如果栈不为空, 且当前温度比栈顶的温度值高, 则先将栈顶元素出栈.
+        while !stack.is_empty() && num > temperatures[*stack.last().unwrap()] {
+            let top_index = stack.pop().unwrap();
+            // 计算下标的偏移量.
+            out[top_index] = (index - top_index) as i32;
+        }
+        // 将当前温度值的下标入栈
+        stack.push(index);
+    }
+
+    out
+}
+
+pub type SolutionFn = fn(Vec<i32>) -> Vec<i32>;
+
+fn check_solution(func: SolutionFn) {
+    let temperatures = vec![73, 74, 75, 71, 69, 72, 76, 73];
+    assert_eq!(&func(temperatures), &[1, 1, 4, 2, 1, 1, 0, 0]);
+
+    let temperatures = vec![30, 40, 50, 60];
+    assert_eq!(&func(temperatures), &[1, 1, 1, 0]);
+
+    let temperatures = vec![30, 60, 90];
+    assert_eq!(&func(temperatures), &[1, 1, 0]);
+}
+
+fn main() {
+    check_solution(daily_temperatures1);
+    check_solution(daily_temperatures2);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{check_solution, daily_temperatures1, daily_temperatures2};
+
+    #[test]
+    fn test_daily_temperatures1() {
+        check_solution(daily_temperatures1);
+    }
+
+    #[test]
+    fn test_daily_temperatures2() {
+        check_solution(daily_temperatures2);
+    }
+}

src/stack/monotonic-stack.md

@@ -0,0 +1,2 @@
+
+# 单调栈 Monotonic Stack