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this problems can be resolved without array #include

include

void solve(){ int n; scanf("%d",&n); int sum = 0; // int *arr = malloc((n) * sizeof(int)); for(size_t i = 0;i < n;i++){ int data; scanf("%d",&data); sum += data; } printf("%d",sum);

} int main(){ solve(); return 0; }

include

include

include

include

int main() {

/* Enter your code here. Read input from STDIN. Print output to STDOUT */  
int n;
int sum=0;
scanf("%d", &n);
int *arr = (int*)malloc(n * sizeof(int));
if (n >= 1 && n <= 1000)
{
    //phase 1: input
    for (int i = 0; i < n; i++){
    scanf("%d", &arr[i]);
    }
    // phase 2: output
    for (int i= 0; i<n; i++){
        sum += arr[i];
    }

}
  printf("%d\n", sum);
  free(arr);
return 0;

}

Here is 1D Arrays in C problem solution - https://programmingoneonone.com/hackerrank-1d-arrays-in-c-solution.html

include

include

include

include

int main(){ int n, sum=0; scanf("%d",&n);

int *arr = (int*)malloc(n * sizeof(int));

for(int i; i < n; i++){
    scanf("%d", &arr[i]);
    sum+=arr[i];
}
printf("%d",sum);
free(arr);

}