View Compilation Error

0_0_2986504_24320.cpp: In function `int find_Set(int)':
0_0_2986504_24320.cpp:10: error: `sx' undeclared (first use this function)
0_0_2986504_24320.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2986504_24320.cpp:11: error: `sxx' undeclared (first use this function)
0_0_2986504_24320.cpp: In function `void union_Set(int, int)':
0_0_2986504_24320.cpp:32: error: `upCount' undeclared (first use this function)
0_0_2986504_24320.cpp: In function `int main()':
0_0_2986504_24320.cpp:41: error: `MAXN' undeclared (first use this function)