View Compilation Error

0_0_14839826_30180.cpp:26:16: error: redefinition of 'long long int sum'
 long long sum, sum;
                ^
0_0_14839826_30180.cpp:26:11: note: 'long long int sum' previously declared here
 long long sum, sum;
           ^
0_0_14839826_30180.cpp: In function 'void dfs(int)':
0_0_14839826_30180.cpp:64:13: error: 'num' was not declared in this scope
             num++;
             ^
0_0_14839826_30180.cpp: In function 'int main()':
0_0_14839826_30180.cpp:100:17: error: 'num' was not declared in this scope
                 num=1;
                 ^