Can any please help me resolve this? I have tried, iostream/stdin, nothing seems to work. https://codeforces.me/contest/1504/submission/111973501.
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Try to flush stdout only after output (not after input).
Actually tried it before, but https://codeforces.me/contest/1504/submission/112014874 doesn't work either.
Your solution not work on input:
2
1 1 2 2
Interactor in that problem is adaptive.
I had the same error message, the reason was that I was outputting 2 lines instead of only 1 in some cases
For the WA test case (first test case) at least, my code gives correct answer, without duplicate lines. https://codeforces.me/contest/1504/submission/112014874
It says it found the end of the file instead of an int, maybe the program isn't outputting everything that it should be...