View Compilation Error

0_0_7673098_1019.cpp: In function `bool dfs(int, int, int)':
0_0_7673098_1019.cpp:48: error: `tx' undeclared (first use this function)
0_0_7673098_1019.cpp:48: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7673098_1019.cpp:48: error: `ty' undeclared (first use this function)
0_0_7673098_1019.cpp:49: error: `fasle' undeclared (first use this function)