System Display: 

A sequence of octal digits appears on the Serial Monitor. ( Refer Referance Image)
Display Error: CHECK ORIENTATION SETTINGS

Decode Clue: 

The string shown is not the actual answer — it’s a disguise. 

First, expand each octal digit into its 3-bit binary equivalent. Then, split the full binary sequence into groups of 4 bits — starting from right to left.
Finally, rebuild the actual PIN by converting those 4-bit codes into normal decimal digits (0–9) using the reference table.

Hint: Octal → Binary. And remember — what you see might be flipped! 

(This is not the actual method of converting octal to decimal. The team has developed a unique set of rules to enhance security and prevent direct decoding.)

Conversion Reference Table: 

Decimal Digit	0	1	2	3	4	5	6	7	8	9
Binary (4-bit)	0000	---	0010	0011	---	0101	---	0111	1000	1001
Octal-style (3-bit)	000	001	---	011	100	---	110	111	--- ---	--- ---

Note:  Use logical reasoning to complete the missing data and decode the actual PIN. 

Question: 

What was the actual PIN entered before the lock activated security mode? 

System Display: 

A binary string appears on the Serial Monitor, along with the following warning. (Refer Referance Image)
Display Error: CHECK ORIENTATION SETTINGS

Decode Clue: 

The string shown is not the actual answer — it’s a disguise. 

1. Split the binary string into groups of 4 

2. Convert each group into a decimal digit (0–9). 

Hint: Binary → Decimal. And remember what you see might be flipped! 

 

Decimal Digit	0	1	2	3	4	5	6	7	8	9
Binary (4-bit)	0000	---	0010	0011	---	0101	---	0111	1000	---

Note: Fill in the missing binary values to decode the hidden PIN correctly. 

Question: 

What was the actual PIN entered before the lock activated security mode? 

Robot Rules & Constraints: 

• Battery capacity: 40000 mAh 

• Maximum load per trip: 7000g 

• Battery usage per metre (based on load weight): 

• 0–2000g → 300 mAh/m 

• 2001–4000g → 500 mAh/m 

• 4001–7000g → 700 mAh/m 

Package Delivery Information: 

Package	Weight	Block	Distance from Dock
P1	2000g	Block A	120 metres
P2	4000g	Block B	150 metres
P3	2500g	Block C	100 metres
P4	3000g	Block D	150 metres

 

Question: 

Which delivery plans enables Rishi’s robot to complete all deliveries with the least number of returns to the dock, while also using the least amount of battery power? 

 Note: 

This is a beta version of the software, which supports only fixed delivery routes. The robot must return using the same path. This limitation will be addressed in the alpha release with dynamic reverse path planning. 

The robot can carry more than one package per trip, provided the total weight does not exceed 6000g. After each trip, it must return to the charging dock to recharge 100% before starting the next trip. 

Ananya wants the robot to complete all deliveries with the fewest return trips to the dock while using the least amount of battery power, all within a 32000 mAh battery limit. 

Robot Rules & Constraints: 

• Battery capacity: 32000 mAh 

• Maximum load per trip: 6000g 

• Battery usage per metre based on load weight: 

• 0–2000g → 300 mAh/m 

• 2001–4000g → 500 mAh/m 

• 4001–6000g → 700 mAh/m  

 

Package Delivery Details: 

Package	Weight	Room	Distance from Dock
P1	3000g	Block A	140 metres
P2	1500g	Block B	120 metres
P3	4500g	Block D	160 metres

 

Distances between Blocks: 

• Block A to Block B: 100 metres 

• Block B to Block C: 120 metres 

• Block C to Block A: 220 metres 

  

Question: 

Which of the following delivery plans allows the robot to complete all deliveries with the fewest return trips to the dock, while also using the least amount of power? 

Note: 

This is a beta version of the software, which supports only fixed delivery routes. The robot must return using the same path. This limitation will be addressed in the alpha release with dynamic reverse path planning.