POUR1 - Pouring water
Given two vessels, one of which can accommodate a litres of water and the other - b litres of water, determine the number of steps required to obtain exactly c litres of water in one of the vessels.
At the beginning both vessels are empty. The following operations are counted as 'steps':
- emptying a vessel,
- filling a vessel,
- pouring water from one vessel to the other, without spilling, until one of the vessels is either full or empty.
An integer t, 1<=t<=100, denoting the number of testcases, followed by t sets of input data, each consisting of three positive integers a, b, c, not larger than 40000, given in separate lines.
For each set of input data, output the minimum number of steps required to obtain c litres, or -1 if this is impossible.
2 5 2 3 2 3 4
Diophantine equation px+qy = r with a little bit simulation
Frankly,I don't know graphs.I could solve it perfectly with recursion.I wonder why graphs??
Was searching for a better solution online (I used DP). After searching for a bit found a really elegant yet simple solution on StackOverflow, (https://stackoverflow.com/questions/17869493/advice-for-pour1-on-spoj)
i got accepted using only map and bfs
bfs will work...........but carefully examine when answer will be "-1"........otherwise enjoy "TLE"
Isn't this problem is too much hard for beginners?
solved it using DP!