代码

#include <stdio.h>

#define MAXN 100001
static unsigned a[MAXN];

static int cmp(const void *x, const void *y) {
    unsigned ux = *(const unsigned*)x, uy = *(const unsigned*)y;
    return (ux > uy) - (ux < uy);
}

int main() {
    unsigned n;
    if (fread(&n, 1, 4, stdin) != 4) return 0;
    if (fread(a, 4, n, stdin) != n) return 0;
    qsort(a, n, 4, cmp);
    fwrite(a, 4, n, stdout);
    return 0;
}

评测结果