please someone help me why the answer to a) is 4: {7,10,15,21}
thank you
a) i got {5,7,10,15,21} therefore it's 5, but the answer is {7,10,15,21} so it's 4.22,5,7,2,23,10,15,21,3,17
a) What is the increasing subsequence of maximal length ?
b) what is the decreasing subsequence of maximal length?
b) {22,10,3} therefore it's 3?
Please help me