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Array Operations.cpp
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Array Operations.cpp
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//{ Driver Code Starts
#include<bits/stdc++.h>
using namespace std;
// } Driver Code Ends
class Solution {
public:
int arrayOperations(int n, vector<int> &arr) {
// code here
int i=0;
int count=0;
int zero=0;
while(i<n){
int j=i;
while(j<n && arr[j]!=0) j++;
if(j>=0 && arr[j-1]!=0) count++;
if(j==n){
if(zero==0) return -1;
else return count;
}
if(arr[j]==0) zero++;
i=j+1;
}
return count;
}
};
//{ Driver Code Starts.
int main(){
int t;
cin>>t;
while(t--){
int n;
cin>>n;
vector<int> arr(n);
for(int i=0;i<n;i++){
cin>>arr[i];
}
Solution obj;
int res = obj.arrayOperations(n, arr);
cout<<res<<endl;
}
}
// } Driver Code Ends