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🧠

Name things for the reader, not the writer.

Tips & tricks

Open the command palette to jump anywhere
Browse blogs and courses by track
Try the live code playground

Language

Runs in the browser · readline() reads stdin

Explorer

Beautiful Triplets

solution.ts

Beautiful Triplets

easy⏱ 15 mintypescriptchallengesproblem-solving-basic-

Exampleinput → output

Input

7 3
1 2 4 5 7 8 10

Output

Sample case — your program reads stdin and prints to stdout.

Count beautiful triplets: three indices i < j < k where arr[j] - arr[i] = d and arr[k] - arr[j] = d. The array is strictly increasing.

Example: arr=[1,2,4,5,7,8,10], d=3 → Triplets: (1,4,7) with values (1,4,7), (2,5,8) with values (2,5,8), (4,7,10) with values (4,7,10) → Answer: 3

Input format First line: n d (space-separated). Second line: n space-separated integers (the array).

Output format A single integer: the count of beautiful triplets.

Constraints 1 ≤ n ≤ 10⁴, 1 ≤ d ≤ 20, 0 ≤ arr[i] ≤ 2×10⁴

Every problem you solve becomes a story you can tell in an interview.

Solving under pressure trains the muscle that's most tested in onsite rounds.
Explaining your approach out loud matters more than reaching the optimal solution.
Consistency wins: 1 challenge daily > 10 challenges on one Saturday a month.

Pro tip:After solving, write 2 lines on what you learned — that's what you'll remember in the interview.

mainIdle

solution.ts

🧠

Name things for the reader, not the writer.

Tips & tricks

Open the command palette to jump anywhere
Browse blogs and courses by track
Try the live code playground

Language

Runs in the browser · readline() reads stdin

Explorer

Beautiful Triplets

solution.ts

Beautiful Triplets

easy⏱ 15 mintypescriptchallengesproblem-solving-basic-

Exampleinput → output

Input

7 3
1 2 4 5 7 8 10

Output

Sample case — your program reads stdin and prints to stdout.

Count beautiful triplets: three indices i < j < k where arr[j] - arr[i] = d and arr[k] - arr[j] = d. The array is strictly increasing.

Example: arr=[1,2,4,5,7,8,10], d=3 → Triplets: (1,4,7) with values (1,4,7), (2,5,8) with values (2,5,8), (4,7,10) with values (4,7,10) → Answer: 3

Input format First line: n d (space-separated). Second line: n space-separated integers (the array).

Output format A single integer: the count of beautiful triplets.

Constraints 1 ≤ n ≤ 10⁴, 1 ≤ d ≤ 20, 0 ≤ arr[i] ≤ 2×10⁴

Every problem you solve becomes a story you can tell in an interview.

Solving under pressure trains the muscle that's most tested in onsite rounds.
Explaining your approach out loud matters more than reaching the optimal solution.
Consistency wins: 1 challenge daily > 10 challenges on one Saturday a month.

Pro tip:After solving, write 2 lines on what you learned — that's what you'll remember in the interview.

mainIdle

solution.ts

Optimus Agency | Professional Web Development