Jul 27, 2023 · Jul 19, 2023 · Jul 19, 2023 · Jul 8, 2023 · Jul 8, 2023 · Jul 9, 2023
diff --git a/problems/0084.柱状图中最大的矩形.md b/problems/0084.柱状图中最大的矩形.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -670,6 +670,61 @@ function largestRectangleArea(heights: number[]): number {
		```


	Rust

	双指针预处理
	```rust

	impl Solution {
	pub fn largest_rectangle_area(v: Vec<i32>) -> i32 {
	let n = v.len();
	let mut left_smaller_idx = vec![-1; n];
	let mut right_smaller_idx = vec![n as i32; n];
	for i in 1..n {
	let mut mid = i as i32 - 1;
	while mid >= 0 && v[mid as usize] >= v[i] {
	mid = left_smaller_idx[mid as usize];
	}
	left_smaller_idx[i] = mid;
	}
	for i in (0..n-1).rev() {
	let mut mid = i + 1;
	while mid < n && v[mid] >= v[i] {
	mid = right_smaller_idx[mid] as usize;
	}
	right_smaller_idx[i] = mid as i32;
	}
	let mut res = 0;
	for (idx, &e) in v.iter().enumerate() {
	res = res.max((right_smaller_idx[idx] - left_smaller_idx[idx] - 1) * e);
	}
	dbg!(res)
	}
	}
	```

	单调栈
	```rust
	impl Solution {
	pub fn largest_rectangle_area1(mut v: Vec<i32>) -> i32 {
	v.insert(0, 0); // 便于使第一个元素能够有左侧<=它的值
	v.push(0); // 便于在结束处理最后一个元素后清空残留在栈中的值
	let mut res = 0;
	let mut stack = vec![]; // 递增的栈
	for (idx, &e) in v.iter().enumerate() {
	while !stack.is_empty() && v[*stack.last().unwrap()] > e {
	let pos = stack.pop().unwrap();
	let prev_pos = *stack.last().unwrap();
	let s = (idx - prev_pos - 1) as i32 * v[pos];
	res = res.max(s);
	}
	stack.push(idx);
	}
	res
	}
	}
	```


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