View Compilation Error

0_0_24547336_29162.cpp:9:12: error: expected unqualified-id before numeric constant
 #define PI 3.1415926
            ^
0_0_24547336_29162.cpp:21:14: note: in expansion of macro 'PI'
 const double PI = acos(-1.0);  
              ^
0_0_24547336_29162.cpp:74:1: error: 'LL' does not name a type
 LL num[MAXN<<2];//保存结果的数组，要开4*MAXN  
 ^
0_0_24547336_29162.cpp: In function 'int main()':
0_0_24547336_29162.cpp:102:13: error: 'num' was not declared in this scope
             num[i] = (LL)(x1[i].x+0.5);  
             ^
0_0_24547336_29162.cpp:102:23: error: 'LL' was not declared in this scope
             num[i] = (LL)(x1[i].x+0.5);  
                       ^
0_0_24547336_29162.cpp:106:13: error: 'num' was not declared in this scope
             num[i+1] += num[i]/10;  
             ^
0_0_24547336_29162.cpp:110:15: error: 'num' was not declared in this scope
         while(num[len] <= 0 && len > 0) len--;//去前置零；  
               ^
0_0_24547336_29162.cpp:112:29: error: 'num' was not declared in this scope
             printf("%I64d", num[i]);  
                             ^