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It is a little known secret that frogs also like to participate in the BAPC. However, to reach Amsterdam they will need to cross lots of rivers. Fortunately, the frog is in good condition and can jump as far as he wants to go. However, jumping a distance of i meters costs the frog i2 units of energy. The only way the frog can reach Amsterdam is by jumping from stop to stop.
The frog, who is of course lazy, would like to minimize the amount of energy he needs to spend. Can you calculate the minimum amount of energy he needs to spend to reach Amsterdam?
2 0 10
3 2 4 6
4 10 20 25 26