online compiler and debugger for c/c++

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#include<iostream> using namespace std; class node{ public: int data; node*right; node*left; node(int d){ data=d; left=NULL; right=NULL; } }; node* buildTree(int*arr,int s,int e){ if(s>e) return NULL; int mid=(s+e)/2; node*root=new node(arr[mid]); root->left=buildTree(arr,s,mid-1); root->right=buildTree(arr,mid+1,e); return root; } void printt(node* root){ if(root==NULL) return; cout<< root->data <<" "; printt(root->left); printt(root->right); return; } int main() { int n,sum=0; cin>>n; int arr[n],ar2[n]; for(int i=0;i<n;i++){ cin>>arr[i]; sum=sum+arr[i]; // ar2[i]=sum; // cout<<ar2[i]<<" "; } int next_sum=0; for(int i=0;i<n;i++){ if(i!=0) next_sum=next_sum+arr[i-1]; ar2[i]= sum-next_sum; if(i==0) ar2[i]=350; // cout<<ar2[i]<<" "; } cout<<endl; node*f=buildTree(ar2,0,n-1); printt(f); return 0; } /* approach = taking input array ie = 20 30 40 50 60 70 80 then finding its ttl sum ie 350 loop 2 --> then making an array of the actual data of the respective nodes which should be in the outputt instead of the given integers eg = if a binary tree is formed then the node 20 should be replaced by the sum of greater num than and equal to 20 ie --> 350 then for 30 it will be ; 350 -(the sum previous terms int the array ) ie 30 -->350-20 = 330 ; then for 40 --> 350 - (20+30)=300 and so on then stored it in an array -->[350 , 330 , 300 , 260 ,210 , 150 ,80 ] then finally made the bst of the array above , THEN Y DOES IT GIVE ALL THE TEST CASES WRONG ??? HELP */

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