View Compilation Error

0_0_1578206_23417.cpp: In function `int dfs(int)':
0_0_1578206_23417.cpp:20: error: `hase' undeclared (first use this function)
0_0_1578206_23417.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1578206_23417.cpp: In function `int main()':
0_0_1578206_23417.cpp:55: error: `abs' undeclared (first use this function)