Again c programming

#include <stdio.h>

int min(int arr[], int length)
{
    int ans = arr[0];
    for (int i = 1; i < length; i++)
        if (arr[i] < ans)
            ans = arr[i];
    return(ans);
}

int max(int arr[], int length)
{
    int ans = arr[0];
    for (int i = 1; i < length; i++)
        if (arr[i] > ans)
            ans = arr[i];
    return(ans);
}

int main()
{
    FILE *ifile, *ofile;
    ifile = fopen("input.txt", "r");
    if (ifile == NULL)
    {
        printf("Create a file and restart a program!");
        return(0);
    }
    ofile = fopen("output.txt", "w");
    int h, w;
    fscanf(ifile, "%d %d", &h, &w);
    int A[h][w];
    for (int i = 0; i < h; i++)
        for (int j = 0; j < w; j++)
            fscanf(ifile, "%d", &A[i][j]);

    int M[h];
    for (int i = 0; i < h; i++)
        M[i] = min(A[i], w);
    fprintf(ofile, "%d", max(M, h));

    fclose(ifile);
    fclose(ofile);
    return(0);
}