View Compilation Error

0_0_8795573_22474.cpp:4: error: `N' was not declared in this scope
0_0_8795573_22474.cpp:4: error: `N' was not declared in this scope
0_0_8795573_22474.cpp: In function `int find(int)':
0_0_8795573_22474.cpp:7: error: `father' undeclared (first use this function)
0_0_8795573_22474.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8795573_22474.cpp: In function `void merge(int, int)':
0_0_8795573_22474.cpp:13: error: `num' undeclared (first use this function)
0_0_8795573_22474.cpp:17: error: `father' undeclared (first use this function)
0_0_8795573_22474.cpp: In function `int main()':
0_0_8795573_22474.cpp:23: error: `N' undeclared (first use this function)
0_0_8795573_22474.cpp:24: error: `father' undeclared (first use this function)
0_0_8795573_22474.cpp:25: error: `num' undeclared (first use this function)