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it's used to lower the execution time in C++ because cin/cout are slower than scanf/printf and by using this statement we can make cin/cout faster than scanf/printf.
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ACM ICPC Team
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https://stackoverflow.com/questions/31162367/significance-of-ios-basesync-with-stdiofalse-cin-tienull
visit this , and read answers.
it's used to lower the execution time in C++ because cin/cout are slower than scanf/printf and by using this statement we can make cin/cout faster than scanf/printf.