### How can we add new test case to the problem which may fail many of AC solutions?↵
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example↵
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In this question (https://codeforces.net/problemset/problem/121/A) if we add a test case (1 1000000000) the following AC solution https://codeforces.net/contest/121/submission/55314787 fails.↵
EDIT 1: Low possibility for such test case but curious if its possible to do as above? ↵
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EDIT 2: Supersized to know this fact that even operations > 1e9 can be done in 2 seconds.↵
Thanks
↵
example↵
------- ↵
In this question (https://codeforces.net/problemset/problem/121/A) if we add a test case (1 1000000000) the following AC solution https://codeforces.net/contest/121/submission/55314787 fails.↵
↵
EDIT 2: Supersized to know this fact that even operations > 1e9 can be done in 2 seconds.↵
Thanks