Help me in solving UWCOI20A problem

help
,
1

My issue

showing failed hidden test case

My code

#include <stdio.h>

int main(void) {
	int T;
	scanf("%d",&T);

    while(T--)
    {
      int N; 
      scanf("%d",&N);
      int A[N];
      for(int i=0;i<N;i++){
          scanf("%d",&A[i]);
      }
      int max_height = A[0];
      for(int i=1;i<N;i++){
          if(A[i]>max_height){
              max_height=A[i];
          }
      }
      printf("%d",max_height);
    }
}

Learning course: Data structures & Algorithms lab
Problem Link: https://www.codechef.com/learn/course/muj-dsa-c/MUJDSAC06/problems/UWCOI20A