sum root to leaf
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int sum(TreeNode* root,int sum)
{
if(root==nullptr)
return 0;
if(root->left==nullptr&&root->right==nullptr)
return sum*10+root->val;
return sum(root->left,sum*10+root->val)+sum(root->right,sum*10+root->val);
}
int sum(TreeNode* root)
{
return sum(root,0);
}
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