Mastery Points
0
Array Rearrangement in dsa
Context & Logic
Rearranging arrays involves reordering elements based on constraints (e.g., alternating positive/negative numbers or moving zeros to the end).
Example
// Example: Move Zeros to End
function moveZeros(nums) {
let lastNonZero = 0;
for (let i = 0; i < nums.length; i++) {
if (nums[i] !== 0) {
[nums[lastNonZero++], nums[i]] = [nums[i], nums[lastNonZero]];
}
}
}Step-by-Step Logic
1
Use a pointer to track the position of the next correctly placed element.
2
Iterate through the array.
3
If the current element satisfies the target condition, swap it with the pointer position.
4
Increment the pointer.
Complexity Metrics
Time Efficiency
O(n)
Memory Footprint
O(1)