http://www.spoj.pl/problems/POUR1/
hw the 2nd given test is correct.

2
3
4
first we fill 3 littre jar with water and put into 4 littre jar den
again fill 3 littre and pour it in 2 littre remaining water in jar is
1 littre put it into 4 littre and we can measure 4 littre of water den
why answer is -1...?

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