In question C of Codeforces round #728 Div 2, my submission passed the pretests but failed system tests on test case 11 which is same as the sample test case. How is this possible?
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Bruh...
pre[0] = a[0];
pre[1] = a[1];
should obviously give RTE for n = 1. Idk why it didnt give RTE on 1st case lol.
If I'm not wrong then you have a line written like vll pre(n) ... Basically size is 1 if n is 1 , Now few lines after you are writing pre[1] = a[....] Which is not possible when size is 1 . So it gives a runtime error when n = 1
In pretests n=1 was the last case so even after the runtime your answers were printed correct so the solution was lucky enough to pass the pretest but in #11 that's not the case bcz n=1 is at the top .
Auto comment: topic has been updated by rupinderg00 (previous revision, new revision, compare).
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When you coding sometimes you don't have to worry much about memory limit, that's why you may wanna spare some space in array/vector to avoid FST in the future.
I think he knows his mistake and its correction. He needs the explaination why this didn't fail on the sample test 1 and why the same sol failed on test 11 while both test cases are same just there is difference in the ordering.
I am not sure why this occurred. This is strange. May be spryzen_v3 is correct.
Yeah now I just think again and it's weird when the author has test 11 in reverse compare to test 1, but still, it's even weirder when his solution passed the first test.