what is my mistake
t = int(input())
for _ in range(t):
n = int(input())
s = input()
for i in range(0, len(s), 2):
if s[i] == '0' and s[i+1] == '0':
print("A")
elif s[i] == '0' and s[i+1] == '1':
print("T")
elif s[i] == '1' and s[i+1] == '0':
print("C")
else:
print("G")
Learning course: Strings using Python
Problem Link: DNA Storage Practice Problem in - CodeChef
# cook your dish here
number_of_test_case = int(input())
for _ in range(number_of_test_case):
length = int(input())
string = input()
encode = ""
i = 0
while(i < length):
first = string[i]
second = string[i+1]
if(first == '0'):
if(second == '0'):
encode = encode + 'A'
else:
encode = encode + 'T'
else:
if(second == '0'):
encode = encode + 'C'
else:
encode = encode + 'G'
i = i + 2
print(encode)
create an empty string then store encoded values to it, after that print the string as output