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• 14:31, 30 August 2026 Admin talk contribs deleted page CSES/Introductory/Missing Number (content was: " For a number series from 1 to n the sum is <math>sum = (n * (n+1))/2</math> so the missing number must be <math>sum - input\_sum</math> <syntaxhighlight lang="python3" line="1"> n = int(input()) nums = map(int, input().split()) print((n * (n + 1) // 2) - sum(nums)) </syntaxhighlight>", and the only contributor was "Admin" (talk))