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0_0_11806406_21892.cpp:1:24: bits/stdc++.h: No such file or directory
0_0_11806406_21892.cpp: In function `LL change(int)':
0_0_11806406_21892.cpp:10: error: `isdigit' undeclared (first use this function)
0_0_11806406_21892.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11806406_21892.cpp: In function `void read(LL&)':
0_0_11806406_21892.cpp:17: error: `getchar' undeclared (first use this function)
0_0_11806406_21892.cpp: In function `int main()':
0_0_11806406_21892.cpp:24: error: `gets' undeclared (first use this function)
0_0_11806406_21892.cpp:27: error: `strlen' undeclared (first use this function)
0_0_11806406_21892.cpp:28: error: `swap' undeclared (first use this function)
0_0_11806406_21892.cpp:39: error: `puts' undeclared (first use this function)