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View Compilation Error

0_0_20982770_21693.cpp:21:17: error: '#' is not followed by a macro parameter
 #define rep(i, n) for (int i=0; i<(n); ++i)
                 ^
0_0_20982770_21693.cpp:22:21: error: '#' is not followed by a macro parameter
 #define repf(i, a, b) for (int i=(a); i<=(b); ++i)
                     ^
0_0_20982770_21693.cpp:39:16: error: stray '#' in program
     pre[x]=len++;
                ^
0_0_20982770_21693.cpp:39:21: error: stray '#' in program
     pre[x]=len++;
                     ^
0_0_20982770_21693.cpp:48:13: error: stray '#' in program
         sum+=down[y];
             ^
0_0_20982770_21693.cpp:50:21: error: stray '#' in program
     down[s]=max(sum+1,down[s]);//最小的
                     ^
0_0_20982770_21693.cpp:75:39: error: stray '#' in program
                 down[x]=max(down[x],y+1);
                                       ^
0_0_20982770_21693.cpp: In function 'void addpage(int, int)':
0_0_20982770_21693.cpp:39:22: error: lvalue required as unary '&' operand
     pre[x]=len++;
                      ^
0_0_20982770_21693.cpp: In function 'bool dfs(int)':
0_0_20982770_21693.cpp:48:17: error: expected primary-expression before '=' token
         sum+=down[y];
                 ^
0_0_20982770_21693.cpp:50:24: error: expected ')' before ';' token
     down[s]=max(sum+1,down[s]);//最小的
                        ^
0_0_20982770_21693.cpp:50:34: error: expected ';' before ')' token
     down[s]=max(sum+1,down[s]);//最小的
                                  ^
0_0_20982770_21693.cpp: In function 'int main()':
0_0_20982770_21693.cpp:61:14: error: 'i' was not declared in this scope
         repf(i,2,n){
              ^
0_0_20982770_21693.cpp:61:19: error: 'repf' was not declared in this scope
         repf(i,2,n){
                   ^
0_0_20982770_21693.cpp:75:42: error: expected ')' before ';' token
                 down[x]=max(down[x],y+1);
                                          ^
0_0_20982770_21693.cpp:75:44: error: expected ';' before ')' token
                 down[x]=max(down[x],y+1);
                                            ^


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