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#![allow(dead_code)]
pub fn remove_duplicates(nums: &mut Vec<i32>) -> i32 {
if nums.len() <= 2 {
return nums.len() as i32;
}
let mut count = 0;
let mut twice = false;
for i in 0..nums.len() - 1 {
if nums[i] != nums[i + 1] {
twice = false;
count += 1;
nums[count] = nums[i + 1];
} else if nums[i] == nums[i + 1] && !twice {
twice = true;
count += 1;
nums[count] = nums[i + 1];
}
}
count as i32 + 1
}
pub fn remove_duplicates2(nums: &mut Vec<i32>) -> i32 {
if nums.len() <= 2 {
return nums.len() as i32;
}
let mut i = 1;
let mut k = i - 1;
let mut j = i + 1;
while j < nums.len() {
if (nums[j] != nums[i]) || (nums[j] == nums[i] && nums[j] != nums[k]) {
k += 1;
nums[i + 1] = nums[j];
i += 1;
}
j += 1;
}
(i + 1) as i32
}
pub fn remove_duplicates3(nums: &mut Vec<i32>) -> i32 {
let mut i = 0;
for j in 0..nums.len() {
if j < 2 || nums[j] > nums[i - 2] {
nums[i] = nums[j];
i += 1;
}
}
i as i32
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test1() {
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates(&mut nums), 5);
let mut nums = vec![0, 0, 1, 1, 1, 1, 2, 3, 3];
assert_eq!(remove_duplicates(&mut nums), 7);
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates(&mut nums), 5);
}
#[test]
fn test2() {
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates2(&mut nums), 5);
let mut nums = vec![0, 0, 1, 1, 1, 1, 2, 3, 3];
assert_eq!(remove_duplicates2(&mut nums), 7);
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates2(&mut nums), 5);
}
#[test]
fn test3() {
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates3(&mut nums), 5);
let mut nums = vec![0, 0, 1, 1, 1, 1, 2, 3, 3];
assert_eq!(remove_duplicates3(&mut nums), 7);
let mut nums = vec![1, 1, 1, 2, 2, 3];
assert_eq!(remove_duplicates3(&mut nums), 5);
}
}