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#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
#define MD (1000000007U)
template<class S, class T> inline S chmax(S &a, T b){
  if(a<b){
    a=b;
  }
  return a;
}
#define main dummy_main
int main(){
  return 0;
}
#undef main
#define TreeNode dummy_TreeNode
struct TreeNode{
}
;
#undef TreeNode
int sz;
int s[100000];
int getsum(TreeNode *root){
  if(root==NULL){
    return 0;
  }
  int res = root->val + getsum(root->left) +  getsum(root->right);
  s[sz++] = res;
  return res;
}
class Solution{
  public:
  int maxProduct(TreeNode* root){
    int i;
    long long all;
    long long res = 0;
    sz = 0;
    all = getsum(root);
    for(i=(0);i<(sz);i++){
      chmax(res, s[i] * (all - s[i]));
    }
    return res % MD;
  }
}
;
// cLay varsion 20200214-1
 
// --- original code ---
// #define main dummy_main
// {}
// #undef main
// 
// #define TreeNode dummy_TreeNode
// struct TreeNode {};
// #undef TreeNode
// 
// int sz, s[1d5];
// 
// int getsum(TreeNode *root){
//   if(root==NULL) return 0;
//   int res = root->val + getsum(root->left) +  getsum(root->right);
//   s[sz++] = res;
//   return res;
// }
// 
// class Solution {
// public:
//   int maxProduct(TreeNode* root) {
//     ll all, res = 0;
//     sz = 0;
//     all = getsum(root);
//     rep(i,sz) res >?= s[i] * (all - s[i]);
//     return res % MD;
//   }
// };
 

prog.cpp:23:12: error: ‘TreeNode’ was not declared in this scope
 int getsum(TreeNode *root){
            ^~~~~~~~
prog.cpp:23:12: note: suggested alternative: ‘remove’
 int getsum(TreeNode *root){
            ^~~~~~~~
            remove
prog.cpp:23:22: error: ‘root’ was not declared in this scope
 int getsum(TreeNode *root){
                      ^~~~
prog.cpp:23:22: note: suggested alternative: ‘rint’
 int getsum(TreeNode *root){
                      ^~~~
                      rint
prog.cpp:33:18: error: ‘TreeNode’ has not been declared
   int maxProduct(TreeNode* root){
                  ^~~~~~~~
prog.cpp: In member function ‘int Solution::maxProduct(int*)’:
prog.cpp:38:22: error: ‘getsum’ cannot be used as a function
     all = getsum(root);
                      ^

Standard output is empty