View Compilation Error

0_0_7939956_12044.cpp: In function `void DFS(int)':
0_0_7939956_12044.cpp:21: error: `a44' undeclared (first use this function)
0_0_7939956_12044.cpp:21: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7939956_12044.cpp:21: error: expected `;' before "ns"