https://www.acmicpc.net/problem/5949
5949번: Adding Commas
Bessie is working with large numbers N (1 <= N <= 2,000,000,000) like 153920529 and realizes that the numbers would be a lot easier to read with commas inserted every three digits (as is normally done in the USA; some countries prefer to use periods every
www.acmicpc.net
1 2 3 4 5 6 7 8 9 10 11 12 13 | def sol(s): answer = '' for i in range(-1, -len(s) - 1, -1): answer += s[i] if i % 3 == 0 and i != -len(s) : answer += ',' return answer[::-1] if __name__ == '__main__': s = input() print(sol(s)) | cs |
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