Created
August 28, 2015 21:40
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| # you can use print for debugging purposes, e.g. | |
| # print "this is a debug message" | |
| def solution(A): | |
| m = len(A) + 1 | |
| expected_sum = (m * (m+1)) / 2 | |
| return expected_sum - sum(A) | |
| # https://codility.com/demo/results/demo4C4YQX-MX2/ | |
| # O(N) or O(N * log(N)) |
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