I'm back with a strange error... I came back on codeforces recently to see that my solution for [problem E] (https://codeforces.net/contest/1902/problem/E) in the most recent educational codeforces round had failed the system tests.↵
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I had the correct algorithm, and I was stuck debugging my code for ages until I submitted a new piece of code which was almost exactly the same and it got accepted. [This](https://codeforces.net/contest/1902/submission/236217048) gets WA, and [this](https://codeforces.net/contest/1902/submission/236217083) gets AC. The only difference in the codes, is that in the second program, I casted a `size_t` to a `long long` before multiplying it to `n`.↵
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Original: ```ans += (long long) s[i].size() * n;```↵
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Modified: ```ans += s[i].size() * n;```↵
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I wouldn't think it would be an overflow error since `size_t` is the same as `unsigned long long` (unless it isn't? — but it is on my machine). This doesn't get marked as an overflow error by the codeforces diagnostics either. What is happening here?
↵
I had the correct algorithm, and I was stuck debugging my code for ages until I submitted a new piece of code which was almost exactly the same and it got accepted. [This](https://codeforces.net/contest/1902/submission/236217048) gets WA, and [this](https://codeforces.net/contest/1902/submission/236217083) gets AC. The only difference in the codes, is that in the second program, I casted a `size_t` to a `long long` before multiplying it to `n`.↵
↵
Original: ```ans += (long long) s[i].size() * n;```↵
↵
Modified: ```ans += s[i].size() * n;```↵
↵
I wouldn't think it would be an overflow error since `size_t` is the same as `unsigned long long` (unless it isn't? — but it is on my machine). This doesn't get marked as an overflow error by the codeforces diagnostics either. What is happening here?
