View Compilation Error

0_0_18005487_18683.cpp: In function 'int main()':
0_0_18005487_18683.cpp:24:16: error: expected ';' before ')' token
   cin >> N >> M)
                ^
0_0_18005487_18683.cpp:25:18: error: expected ';' before ')' token
   for(i=0;i<N;i++)   //初始化每个节点的根节点是本身
                  ^