🌐 Google Cloud DNS & Cloud CDN — Easy Notes


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Async/await

  Async/await An async function is a function declared with the async keyword, and the await keyword is permitted within them. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains. "async and await make promises easier to write" async  makes a function return a Promise await  makes a function wait for a Promise  Async functions Let’s start with the async keyword. It can be placed before a function, like this: async function f() {   return 1; } The word “async” before a function means one simple thing: a function always returns a promise. Other values are wrapped in a resolved promise automatically. For instance, this function returns a resolved promise with the result of 1; let’s test it: async function f() {   return 1; } f().then(alert); // 1 …We could explicitly return a promise, which would be the same: async function f() {   return Promis...
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First negative in every window of size k

 Given an array arr[]  and a positive integer k, find the first negative integer for each and every window(contiguous subarray) of size k. Note: If a window does not contain a negative integer, then return 0 for that window. Examples: Input: arr[] = [-8, 2, 3, -6, 10] , k = 2 Output: [-8, 0, -6, -6] Explanation: Window [-8, 2] First negative integer is -8. Window [2, 3] No negative integers, output is 0. Window [3, -6] First negative integer is -6. Window [-6, 10] First negative integer is -6. Input: arr[] = [12, -1, -7, 8, -15, 30, 16, 28] , k = 3 Output: [-1, -1, -7, -15, -15, 0]  Explanation: Window [12, -1, -7] First negative integer is -1. Window [-1, -7, 8] First negative integer is -1. Window [-7, 8, -15] First negative integer is -7. Window [8, -15, 30] First negative integer is -15. Window [-15, 30, 16] First negative integer is -15. Window [30, 16, 28] No negative integers, output is 0. Input: arr[] = [12, 1, 3, 5] , k = 3 Output: [0, 0]  Explanation: Windo...
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Next Smaller Element

 ven an array, print the Next Smaller Element (NSE) for every element. The NSE for an element x is the first smaller element on the right side of x in the array. For elements for which no smaller element exists (on the right side), then consider NSE as -1.  Examples: Input: [4, 8, 5, 2, 25] Output: [2, 5, 2, -1, -1] Explanation:  The first element smaller than 4 having index > 0 is 2. The first element smaller than 8 having index > 1 is 5. The first element smaller than 5 having index > 2 is 2. There are no elements smaller than 4 having index > 3. There are no elements smaller than 4 having index > 4. Input: [13, 7, 6, 12] Output: [7, 6, -1, -1] Explanation:  The first element smaller than 13 having index > 0 is 7. The first element smaller than 7 having index > 1 is 6. There are no elements smaller than 6 having index > 2. There are no elements smaller than 12 having index > 3.  [Expected Approach] using Stack - O(n) Time O(n) Space ...
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