This is the solution for the question at hackerrank, python triangle quest solution. In the question you have to display the output using just a single for loop and a print statement. If used more then 2 lines of code you will not be awarded any score. So here is that simple 2 line of code using which u can solve triangle quest which is a moderate(difficult) level question.
The complete 2 line code
for i in range(1,input()):
print ((10**i - 1)/ 9)*i
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