View Compilation Error

0_0_4790115_2196.cpp: In function `void DFS(int, int, int)':
0_0_4790115_2196.cpp:16: error: `yj' undeclared (first use this function)
0_0_4790115_2196.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4790115_2196.cpp: In function `int main()':
0_0_4790115_2196.cpp:61: error: `pus' undeclared (first use this function)