I am using fast I/O method in my code for SIMPLESUM problem and instead it is increasing my runtime by give me tle in some subtasks…!! what should i do ?? they have recommended in question to use fast I/O methods !
Your algorithm may still not be fast enough. Happened to me.
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i got ac for some subtask before using I/O ,and later tle for same subtasks…!!
Then maybe your assumed fast i/o isn’t fast 
P.S: The predefined methods of taking inputs in c worked fine for me, so no extra code is required for fast input/output
