70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
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pub enum LandscapeType {
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Mountain,
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Valley,
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Neither,
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}
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fn is_mountain(numbers: &[isize], max: (usize, &isize)) -> bool {
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if max.0 > 0 && max.0 < numbers.len() - 1 {
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for (i, n) in numbers[1..max.0].iter().enumerate() {
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if numbers[i] > *n {
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return false;
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}
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}
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for (i, n) in numbers[1 + max.0..numbers.len() - 1].iter().enumerate() {
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if *n > numbers[max.0 + i] {
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return false;
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}
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}
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true
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} else {
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false
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}
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}
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fn is_valley(numbers: &[isize], min: (usize, &isize)) -> bool {
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if min.0 > 0 && min.0 < numbers.len() - 1 {
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for (i, n) in numbers[1..min.0].iter().enumerate() {
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if numbers[i] < *n {
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return false;
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}
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}
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for (i, n) in numbers[1 + min.0..numbers.len()].iter().enumerate() {
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if *n < numbers[min.0 + i] {
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return false;
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}
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}
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true
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} else {
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false
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}
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}
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pub fn landscape_type(numbers: &[isize]) -> LandscapeType {
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if numbers.is_empty() {
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return LandscapeType::Neither;
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}
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let mut min = (usize::MAX, &isize::MAX);
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let mut max = (usize::MIN, &isize::MIN);
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for (i, n) in numbers.iter().enumerate() {
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if n < min.1 {
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min = (i, n);
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}
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if n > max.1 {
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max = (i, n);
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}
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}
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if is_mountain(numbers, max) {
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LandscapeType::Mountain
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} else if is_valley(numbers, min) {
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LandscapeType::Valley
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} else {
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LandscapeType::Neither
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}
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}
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