Unable to submit solution in C but submitted in c++

question : CodeChef: Practical coding for everyone
c++ solution : CodeChef: Practical coding for everyone
c solution : CodeChef: Practical coding for everyone
plz help me to find out where is the problem in c code and also give any suggestion for optimising this,
according to constraint -
t <= 10^5 and
n <= 10^5
if we have O(n) solution then it might cross 10^8 operation in 1 sec

In second last else if you are not printing in next line

else if(countA < countB)
                {
                    if(countA + remShotA < countB)
                    {
                        printf("%d", i + 1);
                        break;
                    }
                }
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