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I wonder what the full input of testcase 138 in Div1B is. This testcase specifically kills random_device users, isn't it......? Sample code with random_device: http://codeforces.me/contest/1039/submission/42539354 When I use mt19937_64, it works well. Only substituting mt19937_64 for random_device: http://codeforces.me/contest/1039/submission/42539386 Or does random_device have any bad feature I don't know? |