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Name things for the reader, not the writer.

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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

3D Surface Area

solution.ts

3D Surface Area

medium⏱ 15 mintypescriptchallengesproblem-solving-intermediate-

Exampleinput → output

Input

Output

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

2D grid A[i][j] = height (cubes) at cell (i,j). Calculate total surface area of the 3D shape.

Formula: Top + Bottom + 4 sides. For each cell: top=1, bottom=1, each side = max(0, height - neighbor_height) if neighbor exists, else = height. Sum all faces.

Example: Grid [[1,3,4],[2,2,3],[1,2,4]] → Calculate exposed faces for each cell and sum.

Input format First line: H W (space-separated). Next H lines: W space-separated integers each.

Output format A single integer: the total surface area.

Constraints 1 ≤ H, W ≤ 100, 0 ≤ A[i][j] ≤ 100

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

3D Surface Area

solution.ts

3D Surface Area

medium⏱ 15 mintypescriptchallengesproblem-solving-intermediate-

Exampleinput → output

Input

Output

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

2D grid A[i][j] = height (cubes) at cell (i,j). Calculate total surface area of the 3D shape.

Formula: Top + Bottom + 4 sides. For each cell: top=1, bottom=1, each side = max(0, height - neighbor_height) if neighbor exists, else = height. Sum all faces.

Example: Grid [[1,3,4],[2,2,3],[1,2,4]] → Calculate exposed faces for each cell and sum.

Input format First line: H W (space-separated). Next H lines: W space-separated integers each.

Output format A single integer: the total surface area.

Constraints 1 ≤ H, W ≤ 100, 0 ≤ A[i][j] ≤ 100

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