Cheapest Subarray hacker earth solution in C

https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/cheapest-subarray-d628cb65/submissions/?utm_source=header&utm_medium=search&utm_campaign=he-search 

#include<stdio.h>

void main ()

{

    int t;

    scanf("%d",&t);

    while (t--)

    {

        int n;

        scanf("%d",&n);

        int a[n],i=0;

        scanf("%d",&a[i]);

        for (i=1;i<n;i++)

        {

            

            scanf("%d",&a[i]);

            a[i-1]= a[i-1] + a[i];

            

        }

        int min = a[0];

        for (i=1;i<n-1;i++)

            if (min>a[i])

                min = a[i];

        

        printf("%d\n",min);

    }

}

Palindromic Numbers Hacker Earth Solution in C

 https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/palindromic-numbers-7/submissions/?utm_source=header&utm_medium=search&utm_campaign=he-search

int ispallin(int n)

{

int ar[10],c = 0;

    for(;n!=0;n=n/10)

        ar[c++] = n%10;

    for(int i =0, j= c-1; i<j; i++,j--)

        if(ar[i]!=ar[j])

            return 0;

    return 1;

}

int main()

{

int t;

    scanf("%d",&t);

while(t--)

    {

    int a,b;

    scanf("%d%d",&a,&b);

    int ans = 0,c=0;;

    for(int i=a;i<=b;i++)

             if(ispallin(i))

                 c++;

    printf("%d\n",c);

}

return 0;

}

Min Max Hacker Earth solution in C

 https://www.hackerearth.com/practice/basic-programming/implementation/basics-of-implementation/practice-problems/algorithm/min-max-3/submissions/

#include<stdio.h>

int main()

{

int n;

scanf("%d",&n);

int a[n],i,max,min,h[1001]={0},flag=0;

    scanf("%d",&a[0]);

    max=min=a[0];

    h[a[0]]++;

    for(i=1;i<n;i++)

    {

        scanf("%d",&a[i]);

        h[a[i]]++;

        if(max < a[i])

            max=a[i];

        if(min > a[i])

            min=a[i];

    }

for(i=min;i<=max;i++)

        if(h[i] == 0)

        {

            flag=1;

            break;

        }

    if(flag == 1)

        printf("NO");

    else

        printf("YES");

}