Count the ways a row measuring fifty units in length could be filled with blocks three units long. The blocks must be separated by at least one empty space.
Fill an empty row with blocks, a minimum length of 50 units, until the size of the row exceeds 1,000,000 units. The blocks must be separated by at least one empty space.
Count the number of ways a space 50 units long could be filled by tiles, homogeneously, measuring 2, 3 or 4 units long.
Count the number of ways a space 50 units long could be filled by tiles, heterogeneously, measuring 2, 3 or 4 units long.
Prime Subset Sums
Find the number of non-empty subsets of {11, 22, 33,…, 250250250250}, the sum of whose elements is divisible by 250.
Maximum sum from top to bottom of triangular array.
Find the minimal path sum from the top left to the bottom right by moving right and down.
Find the minimal path sum from the left column to the right column.