View Compilation Error

0_0_21004643_13372.cpp:1:15: error: expected constructor, destructor, or type conversion before '(' token
         memset(vis1,0,sizeof(vis1));
               ^
0_0_21004643_13372.cpp:2:15: error: expected constructor, destructor, or type conversion before '(' token
         memset(vis2,0,sizeof(vis2));
               ^
0_0_21004643_13372.cpp:3:9: error: 'vis1' does not name a type
         vis1[0]=1;//0是一定可以称出来的
         ^
0_0_21004643_13372.cpp:4:9: error: expected unqualified-id before 'for'
         for(int i=1;i<=n;i++)
         ^
0_0_21004643_13372.cpp:4:21: error: 'i' does not name a type
         for(int i=1;i<=n;i++)
                     ^
0_0_21004643_13372.cpp:4:26: error: 'i' does not name a type
         for(int i=1;i<=n;i++)
                          ^