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#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *f = fopen("INP.TXT", "r");
int m, n, *a, i, l;
fscanf(f, "%d %d %d", &m, &n, &i);
n *= m;
a = malloc(n * sizeof(int));
for (i = 0; i < n; i++)
fscanf(f, "%d", a + i);
fclose(f);
l = m = *a;
for (i = 1; i < n; i++)
if (a[i] > m)
m = a[i];
for (i = 1; i < n; i++)
if (a[i] < l)
l = a[i];
f = fopen("OUT.TXT", "w");
fprintf(f, "%d\n", m - l);
fclose(f);
return 0;
}
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