View Compilation Error

0_0_10506984_7852.cpp: In function `void cut(int, int, int)':
0_0_10506984_7852.cpp:2: error: `Node' undeclared (first use this function)
0_0_10506984_7852.cpp:2: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10506984_7852.cpp:2: error: `left' undeclared (first use this function)
0_0_10506984_7852.cpp:2: error: `mid' undeclared (first use this function)
0_0_10506984_7852.cpp:2: error: `right' undeclared (first use this function)
0_0_10506984_7852.cpp:2: error: `o' undeclared (first use this function)
0_0_10506984_7852.cpp:3: error: `ss' undeclared (first use this function)
0_0_10506984_7852.cpp:3: error: `split' undeclared (first use this function)
0_0_10506984_7852.cpp:5: error: `merge' undeclared (first use this function)