View Compilation Error

0_0_1497004_15695.cpp: In function `void set(int)':
0_0_1497004_15695.cpp:23: error: `count' undeclared (first use this function)
0_0_1497004_15695.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1497004_15695.cpp: In function `void union_a_b(int, int)':
0_0_1497004_15695.cpp:43: error: `count' undeclared (first use this function)
0_0_1497004_15695.cpp: In function `void DFS()':
0_0_1497004_15695.cpp:82: error: `count' undeclared (first use this function)