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feat: add rust solution to lc problem: No.0085 #1528

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Aug 28, 2023
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feat: add rust solution to lc problem: No.0085 #1528

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feat: add rust solution to lc problem: No.0085
xzhseh Aug 27, 2023
28892af
Merge branch 'main' into feat-0085
xzhseh Aug 27, 2023
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80 changes: 80 additions & 0 deletions solution/0000-0099/0085.Maximal Rectangle/README.md
View file
Original file line number Diff line number Diff line change
@@ -194,6 +194,86 @@ public:
};
```

### **Rust**

```rust
impl Solution {
#[allow(dead_code)]
pub fn maximal_rectangle(matrix: Vec<Vec<char>>) -> i32 {
let n = matrix[0].len();
let mut heights = vec![0; n];
let mut ret = -1;

for row in &matrix {
Self::array_builder(row, &mut heights);
ret = std::cmp::max(ret, Self::largest_rectangle_area(heights.clone()));
}

ret
}

/// Helper function, build the heights array according to the input
#[allow(dead_code)]
fn array_builder(input: &Vec<char>, heights: &mut Vec<i32>) {
for (i, &c) in input.iter().enumerate() {
heights[i] += match c {
'1' => 1,
'0' => {
heights[i] = 0;
0
}
_ => panic!("This is impossible"),
};
}
}

/// Helper function, see: https://leetcode.com/problems/largest-rectangle-in-histogram/ for details
#[allow(dead_code)]
fn largest_rectangle_area(heights: Vec<i32>) -> i32 {
let n = heights.len();
let mut left = vec![-1; n];
let mut right = vec![-1; n];
let mut stack: Vec<(usize, i32)> = Vec::new();
let mut ret = -1;

// Build left vector
for (i, h) in heights.iter().enumerate() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
left[i] = -1;
} else {
left[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

stack.clear();

// Build right vector
for (i, h) in heights.iter().enumerate().rev() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
right[i] = n as i32;
} else {
right[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

// Calculate the max area
for (i, h) in heights.iter().enumerate() {
ret = std::cmp::max(ret, (right[i] - left[i] - 1) * *h);
}

ret
}
}
```

### **Go**

```go
80 changes: 80 additions & 0 deletions solution/0000-0099/0085.Maximal Rectangle/README_EN.md
View file
Original file line number Diff line number Diff line change
@@ -164,6 +164,86 @@ public:
};
```

### **Rust**

```rust
impl Solution {
#[allow(dead_code)]
pub fn maximal_rectangle(matrix: Vec<Vec<char>>) -> i32 {
let n = matrix[0].len();
let mut heights = vec![0; n];
let mut ret = -1;

for row in &matrix {
Self::array_builder(row, &mut heights);
ret = std::cmp::max(ret, Self::largest_rectangle_area(heights.clone()));
}

ret
}

/// Helper function, build the heights array according to the input
#[allow(dead_code)]
fn array_builder(input: &Vec<char>, heights: &mut Vec<i32>) {
for (i, &c) in input.iter().enumerate() {
heights[i] += match c {
'1' => 1,
'0' => {
heights[i] = 0;
0
}
_ => panic!("This is impossible"),
};
}
}

/// Helper function, see: https://leetcode.com/problems/largest-rectangle-in-histogram/ for details
#[allow(dead_code)]
fn largest_rectangle_area(heights: Vec<i32>) -> i32 {
let n = heights.len();
let mut left = vec![-1; n];
let mut right = vec![-1; n];
let mut stack: Vec<(usize, i32)> = Vec::new();
let mut ret = -1;

// Build left vector
for (i, h) in heights.iter().enumerate() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
left[i] = -1;
} else {
left[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

stack.clear();

// Build right vector
for (i, h) in heights.iter().enumerate().rev() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
right[i] = n as i32;
} else {
right[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

// Calculate the max area
for (i, h) in heights.iter().enumerate() {
ret = std::cmp::max(ret, (right[i] - left[i] - 1) * *h);
}

ret
}
}
```

### **Go**

```go
75 changes: 75 additions & 0 deletions solution/0000-0099/0085.Maximal Rectangle/Solution.rs
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,75 @@
impl Solution {
#[allow(dead_code)]
pub fn maximal_rectangle(matrix: Vec<Vec<char>>) -> i32 {
let n = matrix[0].len();
let mut heights = vec![0; n];
let mut ret = -1;

for row in &matrix {
Self::array_builder(row, &mut heights);
ret = std::cmp::max(ret, Self::largest_rectangle_area(heights.clone()));
}

ret
}

/// Helper function, build the heights array according to the input
#[allow(dead_code)]
fn array_builder(input: &Vec<char>, heights: &mut Vec<i32>) {
for (i, &c) in input.iter().enumerate() {
heights[i] += match c {
'1' => 1,
'0' => {
heights[i] = 0;
0
}
_ => panic!("This is impossible"),
};
}
}

/// Helper function, see: https://leetcode.com/problems/largest-rectangle-in-histogram/ for details
#[allow(dead_code)]
fn largest_rectangle_area(heights: Vec<i32>) -> i32 {
let n = heights.len();
let mut left = vec![-1; n];
let mut right = vec![-1; n];
let mut stack: Vec<(usize, i32)> = Vec::new();
let mut ret = -1;

// Build left vector
for (i, h) in heights.iter().enumerate() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
left[i] = -1;
} else {
left[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

stack.clear();

// Build right vector
for (i, h) in heights.iter().enumerate().rev() {
while !stack.is_empty() && stack.last().unwrap().1 >= *h {
stack.pop();
}
if stack.is_empty() {
right[i] = n as i32;
} else {
right[i] = stack.last().unwrap().0 as i32;
}
stack.push((i, *h));
}

// Calculate the max area
for (i, h) in heights.iter().enumerate() {
ret = std::cmp::max(ret, (right[i] - left[i] - 1) * *h);
}

ret
}
}