Implemented problems 26, 27, 28 and 29

TODO: improve problem 29
This commit is contained in:
Egor 2024-07-08 15:35:12 +03:00
parent e714a84a6d
commit 00dda7fc5c
5 changed files with 157 additions and 0 deletions

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@ -25,3 +25,7 @@ pub mod p22_generate_parentheses;
pub mod p23_merge_k_sorted_lists; pub mod p23_merge_k_sorted_lists;
pub mod p24_swap_nodes_in_pairs; pub mod p24_swap_nodes_in_pairs;
pub mod p25_reverse_nodes_in_k_group; pub mod p25_reverse_nodes_in_k_group;
pub mod p26_remove_duplicates_from_sorted_array;
pub mod p27_remove_element;
pub mod p28_find_the_index_of_the_first_occurence_in_a_string;
pub mod p29_divide_two_integers;

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@ -0,0 +1,37 @@
pub struct Solution;
impl Solution {
pub fn remove_duplicates(nums: &mut Vec<i32>) -> i32 {
let mut size = 1;
for i in 1..nums.len() {
if nums[i - 1] != nums[i] {
nums[size] = nums[i];
size += 1;
}
}
nums.truncate(size);
return size as i32;
}
}
#[cfg(test)]
mod test {
use super::Solution;
#[test]
fn test1() {
let mut data = vec![1,1,2];
let expected = vec![1,2];
let result = Solution::remove_duplicates(&mut data);
assert_eq!(result, expected.len() as i32);
assert_eq!(data, expected);
}
#[test]
fn test2() {
let mut data = vec![0,0,1,1,1,2,2,3,3,4];
let expected = vec![0,1,2,3,4];
let result = Solution::remove_duplicates(&mut data);
assert_eq!(result, expected.len() as i32);
assert_eq!(data, expected);
}
}

32
src/p27_remove_element.rs Normal file
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@ -0,0 +1,32 @@
pub struct Solution;
impl Solution {
pub fn remove_element(nums: &mut Vec<i32>, val: i32) -> i32 {
nums.retain(|x| *x != val);
return nums.len() as i32;
}
}
#[cfg(test)]
mod tests {
use super::Solution;
#[test]
fn test1() {
let expected = vec![2,2];
let mut data = vec![3,2,2,3];
let result = Solution::remove_element(&mut data, 3);
data.sort();
assert_eq!(data, expected);
assert_eq!(result, expected.len() as i32);
}
#[test]
fn test2() {
let expected = vec![0,0,1,3,4];
let mut data = vec![0,1,2,2,3,0,4,2];
let result = Solution::remove_element(&mut data, 2);
data.sort();
assert_eq!(data, expected);
assert_eq!(result, expected.len() as i32);
}
}

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@ -0,0 +1,21 @@
pub struct Solution;
impl Solution {
pub fn str_str(haystack: String, needle: String) -> i32 {
return haystack.find(&needle).map(|x| x as i32).unwrap_or(-1);
}
}
#[cfg(test)]
mod tests {
use super::Solution;
#[test]
fn test1() {
assert_eq!(Solution::str_str("sadbutsad".to_string(), "sad".to_string()), 0);
}
#[test]
fn test2() {
assert_eq!(Solution::str_str("leetcode".to_string(), "leeto".to_string()), -1);
}
}

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@ -0,0 +1,63 @@
pub struct Solution;
impl Solution {
// terrible solutionE
// should use approximation using shifts
pub fn divide(mut dividend: i32, mut divisor: i32) -> i32 {
if dividend == i32::MAX && divisor == i32::MIN {
return 0;
}
if divisor == 1 {
return dividend;
}
if divisor == -1 {
if dividend == i32::MIN {
return i32::MAX;
}
return -dividend;
}
let mut result = 0;
let is_neg = (dividend < 0) ^ (divisor < 0);
let mut one = false;
dividend = if dividend == i32::MIN {
one = true;
i32::MAX
} else { dividend.abs() };
divisor = if divisor == i32::MIN { i32::MAX } else { divisor.abs() };
while dividend >= divisor {
dividend -= divisor;
result += 1;
}
if one && dividend - divisor == -1 {
result += 1;
}
if is_neg {
result = -result;
}
return result;
}
}
#[cfg(test)]
mod tests {
use super::Solution;
#[test]
fn test1() {
assert_eq!(Solution::divide(10, 3), 3);
}
#[test]
fn test2() {
assert_eq!(Solution::divide(7, -3), -2);
}
#[test]
fn test3() {
assert_eq!(Solution::divide(-2147483648, 2), -1073741824);
}
#[test]
fn test4() {
assert_eq!(Solution::divide(-2147483648, -1), 2147483647);
}
}