0_0_11409783_32336.cpp: In function `void btree(int, int, int)':
0_0_11409783_32336.cpp:18: error: `scanf' undeclared (first use this function)
0_0_11409783_32336.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11409783_32336.cpp: In function `int main()':
0_0_11409783_32336.cpp:63: error: `scanf' undeclared (first use this function)
0_0_11409783_32336.cpp:68: error: `printf' undeclared (first use this function)
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