View Compilation Error

0_0_2957307_9990.cpp: In member function `void node::newnode(int, int)':
0_0_2957307_9990.cpp:18: error: `ns' undeclared (first use this function)
0_0_2957307_9990.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2957307_9990.cpp: At global scope:
0_0_2957307_9990.cpp:57: error: `node ns[200000]' used prior to declaration