An encrypts messages as follows. First remove spaces and write the message row by row into four columns. For “My name is beaver”, the example table is:
Then choose an order for columns 1,2,3,4 and write every letter in each chosen column from top to bottom. For example, order 3,2,1,4 gives “nia yeer Mmbe asv”. An encrypts “I wrote a letter” using column order 3,1,2,4. Which code results?
A car moves on this game board following these instructions:
- Go straight until blocked by an apple.
- Turn right, then go straight until blocked by an apple.
- Turn left, move forward one cell, then turn right and go straight until blocked by an apple.
- Turn right and go straight until blocked by an apple.
Beaver moves from START to STOP through the grid. At each step Beaver may move to the immediately adjacent cell on the right or immediately below, if it exists.
Each cell’s number is the energy consumed when passing through it. What is the least total energy Beaver can consume on the journey?
Pressing A, B or C opens that gate for exactly one ball, which falls into storage (“Kho dự trữ”). The balls in storage must be in increasing order from bottom to top. What is the greatest number of balls that can enter storage?
There are four animal species in the forest: owl, rabbit, pig and ferret. They occupy the twelve circular houses shown.
The species living at X,Y,Z are unknown. Two houses are adjacent if a path directly connects them, and adjacent houses cannot contain the same species. Every species occupies the same number of houses. Which assignment satisfies these rules?
Beaver wants to make a bouquet using these instructions:
- Take one flower from pot 1. If it is a daisy, take one extra rose as well. The source symbols for daisy and rose are shown in this clause:
- Take one more flower from pot 1.
- Take a leafy branch from pot 2, wrap the bouquet and finish.
How many different bouquet results can these instructions produce?
TechGenius has two automatic machines. At any time, each machine can perform at most one task. Four tasks require the times in this table.
English: task A takes 6 minutes, B 4 minutes, C 9 minutes, D 3 minutes. Extra machines can be hired at 500 đồng each. What is the smallest rental cost that allows all four tasks to finish in the shortest possible time?
A tune may begin at any note, but every later note must follow an arrow. A note may occur any number of times. Two notes have been erased from this tune:
An island has three chests: one on a mountain, one under a tree and one on a sandy beach. All three are empty in the morning. At some point during the day, pirates fill one chest with treasure. Beaver takes three photos of the chests, exactly one before the pirates act:
- Photo 1 shows the beach chest, empty.
- Photo 2 shows the beach and tree chests, both empty.
- Photo 3 shows the tree and mountain chests, both empty.
Which chest did the pirates fill?
