America football rules
safty 2 points
field goal 3 points
touchdown 7 points
To get to a point S, how many possible combinations can happen.
It is graph, starting from 3 possible points 2, 3, 7, and each has three possible path to +2, +3, +7, and so on. in the end. the score has to be s.
It is the same as find a path in the graph such that the path sum is s.
Solve:
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