Introduction - If you have any usage issues, please Google them yourself
The method of binary search is one of the most efficient methods. Hypothesis has already ranked in accordance with the order of the growing up five integers a0 ~ a4, to find the number is X, its basic idea is: the scope of the data set to find the lower limit for l = 1, up to h = 5, strives for the midpoint m = (l + h) / 2, with X compared with neutral element am, if X is equal to the am, is found, stop looking for; Otherwise, if X is greater than am, replace the lower bound l=m+ 1, and continue to find it in the lower half; If X is less than am, change the upper limit h is equal to m minus 1, and continue to find it in the first half; Repeat the previous process until you find or l> h. If l> h, you don't have this number, print can't find the information, the program ends.