View Compilation Error

0_0_15402367_6161.c:12:15: error: unknown type name 'node'
 void add_edge(node e,int k)  
               ^
0_0_15402367_6161.c: In function 'main':
0_0_15402367_6161.c:58:1: error: expected expression before '/' token
 // freopen("in.txt","r",stdin);  
 ^