View Compilation Error

0_0_9698575_7718.cpp: In function `void BuildTrie()':
0_0_9698575_7718.cpp:47: error: `TXC' undeclared (first use this function)
0_0_9698575_7718.cpp:47: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9698575_7718.cpp: In function `int main()':
0_0_9698575_7718.cpp:87: error: `f2' undeclared (first use this function)