Why am I getting WA in A2?

Here is the link to the problem:

Here is the code:

#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<string>
#include<string.h>
#include<math.h>
#include<set>
#include<vector>
#include<utility>

using namespace std;

int main( ) {

    //numLeaves is the number of leaves input k times
    //ctrNextLevel is the number of stems expected in the next level(leaf or child producing)
    //numProducers is a temp variable used to calculate ctrNextLevel

    int t, k, numLeaves, ctrNextLevel, numProducers;

    //used as a flag if a wrong count is detected
    bool countWrong;
    cin>>t;

    while ( t-- ) {

        cin>>k;

        countWrong = false;

        for ( int i = 0; i < k; i++ ) {

            scanf("%d", &numLeaves);

            if ( countWrong == true ) {
                continue;
            }

            // first level must have 1 or 0, anything else is wrong.
            if ( i == 0 ) {
                if ( numLeaves == 0 ) {
                    ctrNextLevel = 2;
                }
                else if ( numLeaves == 1 ) {
                    ctrNextLevel = 0;
                }
                else {
                    countWrong = true;
                }
            }
            else { //for all levels after the first level
                if ( numLeaves > ctrNextLevel ) {
                    countWrong = true;
                }
                else if ( numLeaves == ctrNextLevel ) {
                    ctrNextLevel = 0;
                }
                else {
                    numProducers = ctrNextLevel - numLeaves;
                    ctrNextLevel = numProducers * 2;
                    if ( i == ( k - 1 ) ) {
                        countWrong = true;
                    }
                }
            }
        }
        if ( countWrong == true ) {
            cout<<"No"<<endl;
        }
        else {
            cout<<"Yes"<<endl;
        }
    }

    return 0;
}

    return 0;
}

Your solution is correct for all test cases except when all 0s are there in the input. Fix that.

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