I have observed that one of user in my friend list had given the contest yesterday and solved three questions in contest. I was just looking through standings today and there I saw that all of his submissions were skipped from testing and his participation was shown as out of contest. I was just curious, what is reason for this ?

Hi. I was wondering if there is any upperbound to the size of euler walk with respect to number of vertices. If yes then what will be that maximizing condition?

My submission https://mirror.codeforces.com/contest/1148/submission/55003775 is getting runtime error on testcase 43 . But the same submission is giving correct answer on other online ide's like online gdb . Please someone look into it .