View Compilation Error

0_0_9179413_12361.cpp: In function `void dfs(int)':
0_0_9179413_12361.cpp:24: error: `sum' undeclared (first use this function)
0_0_9179413_12361.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9179413_12361.cpp: In function `int main()':
0_0_9179413_12361.cpp:72: error: expected `;' before "printf"