Tricks to Solve the Missing Number Problem

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[{"selector":"#anim-0e2330e4-1641-4e6d-b34b-77067d22442d","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-391873bf-3e51-41d8-80b5-e14bf349eb6e","keyframes":{"transform":["translate3d(-102.58397%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d04c5b6e-8935-47bb-a787-d99289904eba","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f5c5350c-6e85-4025-96c0-efb043c38797","keyframes":{"transform":["translate3d(-102.65252%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5c9e40e8-7d68-4958-b910-4c63a745fbce","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Sum all elements in the array and subtract it from the summation of the first N natural numbers using the formula N * (N + 1) / 2 to find the missing number. Check out the code implementation to find out the missing number! Click here

XoR Approach

[{"selector":"#anim-e5241d85-ef36-42f0-815b-e5a54061651d","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e760dfe6-a885-4bdf-8ddf-d2550effcfa0","keyframes":{"transform":["translate3d(-102.58397%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-164ff2ca-e6f5-4203-bf4b-aef11ac28afd","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ef60353a-2512-4a22-b65b-37dab18ddcf1","keyframes":{"transform":["translate3d(-102.65252%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e38b4fd4-ca44-4783-9210-543a18b5f0f7","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Utilize the XOR property. Calculate a1 ^ a2 ^ ... ^ an = A1, a1 ^ a2 ^ ... ^ an-1 = A2. Then calculate A1 ^ A2 to find the missing number. Check out the code implementation to find out the missing number! Click here

Binary Search Method

[{"selector":"#anim-04b37382-95e8-4ffd-96a7-cfc5f29168c8","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-18c3b557-cb3b-4787-8466-fb97557c0ea2","keyframes":{"transform":["translate3d(-102.58397%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7b2ba1d8-a9c6-469d-93c2-c3b4edd010a3","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-af52810b-6883-446b-bf45-6a4a4e248b63","keyframes":{"transform":["translate3d(-102.65252%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-23179098-9eaf-46bd-9b20-38e8b06e4b47","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Sort the array & then perform a binary search to find the missing number efficiently. Adjust the search space based on comparing middle element with its index. Check out the code implementation to find out the missing number! Click here

Hashing Technique

[{"selector":"#anim-3ff361e5-929f-40b8-badd-4dd9d48768dd","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9cdc7593-2f03-4862-b8a9-08a7b64d6a6a","keyframes":{"transform":["translate3d(-102.58397%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-865ee52b-1dbc-46ed-a1d4-d3175f987eb5","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-71be1a6d-5368-4ec1-9662-6961c84fae3d","keyframes":{"transform":["translate3d(-102.65252%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-533030cb-8516-4bd6-920f-c4fe5904af8a","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Create a hash set and store all array elements. Iterate through N natural numbers, checking if each exists in the hash set. The missing number is the one not found. Check out the code implementation to find out the missing number! Click here

Mathematical Deduction

[{"selector":"#anim-fc04bcc4-f907-4d1b-8225-cca4369c2335","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-90302c9f-5211-4320-bc43-27220c95b3d2","keyframes":{"transform":["translate3d(-102.58397%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-199cfee5-5fad-4306-a2f3-2d488bed9e1c","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d24e2e1c-76ed-496c-8fdc-b2e8808fbef4","keyframes":{"transform":["translate3d(-102.65252%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-36a907c2-32a8-4620-99f5-e9a039ce6768","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Use a mathematical deduction. Calculate the expected sum and subtract the actual sum of the array to find the missing number. Check out the code implementation to find out the missing number! Click here

Start your journey now and learn how to find out the missing integer from an array with code implementation.

[{"selector":"#anim-46f0fa36-14fa-4bdb-b382-b41ab8cd907c [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(24.88558371261062%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Click here

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[{"selector":"#anim-30b9c5a1-ce64-4873-bfa3-a268dc1d7546","keyframes":{"opacity":[0,1]},"delay":0,"duration":1000,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-02ac5a77-b326-42df-979c-935296b32a25","keyframes":{"transform":["translate3d(0px, 352.93213%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":1000,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0a0101ee-3274-4122-a142-8389068cf7df","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0fa26e92-c42d-453c-a8c4-57933899b3fd","keyframes":{"transform":["translate3d(0px, 197.40339%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Improve your Interviewing Skills with Scaler! SWIPE UP

Tricks to Solve the Missing Number Problem

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1

Simple Approach

XoR Approach

2

Binary Search Method

3

Hashing Technique

4

Mathematical Deduction

5

Start your journey now and learn how to find out the missing integer from an array with code implementation.

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