统计碱基序列中ATCG出现的个数
题目
Given: A DNA string “s” of length at most 1000 nt.
Return: Four integers (separated by spaces) counting the respective number of times that the symbols ‘A’, ‘C’, ‘G’, and ‘T’ occur in “s”.
Example input:
AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC
Should output:
20 12 17 21

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