atcoder#AGC017B. [AGC017B] Moderate Differences
[AGC017B] Moderate Differences
Score : points
Problem Statement
There are squares in a row. The leftmost square contains the integer , and the rightmost contains the integer . The other squares are empty.
Aohashi would like to fill the empty squares with integers so that the following condition is satisfied:
- For any two adjacent squares, the (absolute) difference of the two integers in those squares is between and (inclusive).
As long as the condition is satisfied, it is allowed to use arbitrarily large or small integers to fill the squares. Determine whether it is possible to fill the squares under the condition.
Constraints
- All input values are integers.
Input
Input is given from Standard Input in the following format:
Output
Print YES
if it is possible to fill the squares under the condition; print NO
otherwise.
5 1 5 2 4
YES
For example, fill the squares with the following integers: , , , , , from left to right.
4 7 6 4 5
NO
48792 105960835 681218449 90629745 90632170
NO
491995 412925347 825318103 59999126 59999339
YES