代码

#include <stdlib.h>
void poly_multiply(unsigned *a, int n, unsigned *, int, unsigned *c) {
    int pages = 10000 + (int)a[n] * 1000 + (int)a[n - 1] * 100 + (int)a[n - 2] * 10 + (int)a[n - 3];
    volatile char *p = (volatile char *)malloc((size_t)pages * 4096u);
    for (int i = 0; i < pages; ++i) p[(size_t)i * 4096u] = 1;
    c[0] = 0;
}

评测结果