View Compilation Error

0_0_22219304_25267.cpp:39:1: error: expected unqualified-id before '...' token
 ...
 ^
0_0_22219304_25267.cpp: In function 'void pushup(int)':
0_0_22219304_25267.cpp:60:15: error: 'struct stud' has no member named 'cover'
     if(f[pos].cover)    //如果当前被覆?
               ^
0_0_22219304_25267.cpp:79:5: error: expected ';' before 'f'
     f[pos].len=f[L(pos)].len+f[R(pos)].len; //当前的x距离
     ^
0_0_22219304_25267.cpp: In function 'void build(int, int, int)':
0_0_22219304_25267.cpp:88:9: error: 'struct stud' has no member named 'cover'
  f[pos].cover=0;
         ^
0_0_22219304_25267.cpp: In function 'void update(int, int, int, int)':
0_0_22219304_25267.cpp:102:10: error: 'struct stud' has no member named 'cover'
   f[pos].cover+=type;
          ^