|
1 | | -import sys |
| 1 | +def max_frequency(chars: str) -> tuple: |
| 2 | + """ This function returns the element that has the most repetitions in the DNA strand """ |
| 3 | + prevous_max = 0 |
| 4 | + current_max = 0 |
| 5 | + max_char = "" |
| 6 | + A = len(chars) - 1 |
| 7 | + i = 0 |
2 | 8 |
|
3 | | -def find_seq(dna,sample): |
4 | | - """return number of sequences OF sample in a dna""" |
| 9 | + while i < A: |
| 10 | + j = i |
| 11 | + current_max = 0 |
5 | 12 |
|
6 | | - #safty check |
7 | | - if (sample not in ['A', 'T', 'C', 'G']): |
8 | | - #invalid sample |
9 | | - return 0 |
| 13 | + while A >= j and chars[j] == chars[i]: |
| 14 | + current_max += 1 |
| 15 | + j += 1 |
10 | 16 |
|
11 | | - point = 0 |
12 | | - for i in range(len(dna)): |
13 | | - if (dna[i] == sample): |
14 | | - point += 1 |
15 | | - return point |
| 17 | + if current_max >= prevous_max: |
| 18 | + prevous_max = current_max |
| 19 | + max_char = chars[i] |
16 | 20 |
|
| 21 | + i += 1 |
| 22 | + return max_char, prevous_max |
17 | 23 |
|
18 | | -def main(): |
19 | | - user = input("Enter Dna SEQUENCE: ").strip().upper() |
20 | | - lenght = len(user) |
21 | | - |
22 | | - biggest = 0 |
23 | | - for i in range(lenght): |
24 | | - temp = find_seq(sample = user[i],dna = user) |
25 | | - |
26 | | - if (temp > biggest): |
27 | | - biggest = temp |
28 | 24 |
|
29 | | - # print biggest number of sequences in dna |
30 | | - print(biggest) |
31 | | - |
| 25 | +def main(): |
| 26 | + chars = "aaabbbaaabbbbbbbbaaaaaaaaaaababababababababbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" |
| 27 | + r = max_frequency(chars=chars) |
| 28 | + print(r) |
32 | 29 |
|
33 | | -main() |
| 30 | +if __name__ == "__main__": |
| 31 | + main() |
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