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0977: Squares of a sorted array#4

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golevy merged 1 commit intodevelopfromlevy/squares-of-a-sorted-array
Apr 28, 2024
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58 changes: 58 additions & 0 deletions0977-Squares_of_a_Sorted_Array/main.ts
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// let nums = [-4, -1, 0, 3, 10];
let nums = [-7, -3, 2, 3, 11];

function sortedSquaresByMapping(nums: number[]): number[] {
return nums.map((i) => i * i).sort((a, b) => a - b);
}

function sortedSquaresFromTwoEnds(nums: number[]): number[] {
const ans = new Array(nums.length);
let left = 0,
right = nums.length - 1;

for (let i = nums.length - 1; i >= 0; i--) {
if (Math.abs(nums[left]) > Math.abs(nums[right])) {
ans[i] = nums[left] * nums[left];
left++;
} else {
ans[i] = nums[right] * nums[right];
right--;
}
}

return ans;
}

function sortedSquaresByUnshifting(nums: number[]): number[] {
const ans: number[] = [];
let left = 0,
right = nums.length - 1;

while (left <= right) {
if (Math.abs(nums[left]) > nums[right]) {
ans.unshift(nums[left] ** 2);
left++;
} else {
ans.unshift(nums[right] ** 2);
right--;
}
}

return ans;
}

console.time("sortedSquaresByMapping");
let resultByMapping = sortedSquaresByMapping(nums);
console.timeEnd("sortedSquaresByMapping");

console.time("sortedSquaresFromTwoEnds");
let resultFromTwoEnds = sortedSquaresFromTwoEnds(nums);
console.timeEnd("sortedSquaresFromTwoEnds");

console.time("sortedSquaresByUnshifting");
let resultByUnshifting = sortedSquaresByUnshifting(nums);
console.timeEnd("sortedSquaresByUnshifting");

console.log(resultByUnshifting);
console.log(resultByMapping);
console.log(resultFromTwoEnds);
21 changes: 21 additions & 0 deletions0977-Squares_of_a_Sorted_Array/readme.md
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# 977. Squares of a Sorted Array

Given an integer array `nums` sorted in <b>non-decreasing</b> order, return <i>an array of <b>the squares of each number</b> sorted in non-decreasing order</i>.

## Example 1:

> <span style="color: white;">Input</span>: nums = [-4, -1, 0, 3, 10]<br>
> <span style="color: white;">Output</span>: [0, 1, 9, 16, 100]<br>
> <span style="color: white;">Explanation</span>: After squaring, the array becomes [16, 1, 0, 9, 100].<br>
> After sorting, it becomes [0, 1, 9, 16, 100].

## Example 2:

> <span style="color: white;">Input</span>: nums = [-7, -3, 2, 3, 11]<br>
> <span style="color: white;">Output</span>: [4, 9, 9, 49, 121]

## Constraints:

- 1 <= nums.length <= 10<sup>4</sup>
- -10<sup>4</sup> <= nums[i] <= 10<sup>4</sup>
- `nums` is sorted in <b>non-decreasing</b> order.
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