0_0_2540294_30419.cpp: In function `void YangHui(int&)':
0_0_2540294_30419.cpp:17: error: `printf' undeclared (first use this function)
0_0_2540294_30419.cpp:17: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2540294_30419.cpp: In function `int main(int, char**)':
0_0_2540294_30419.cpp:26: error: `scanf' undeclared (first use this function)
0_0_2540294_30419.cpp:26: error: `EOF' undeclared (first use this function)
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