What logic is involved in solving this?
Should I simply pick the last number in each list or should I pick the highest number in the list?
I am confused with the the first test case, where the sum ought to be 23. If I pick the last number in the list, the sum turns out to be 17 and not 23.
checkio([ [1], [2, 3], [3, 3, 1], [3, 1, 5, 4], [3, 1, 3, 1, 3], [2, 2, 2, 2, 2, 2], [5, 6, 4, 5, 6, 4, 3] ])