代码

void my_memset(char *a, char c, unsigned n) {
unsigned i = 0;
for (; i + 4 < n; i += 4)
a[i] = a[i + 1] = a[i + 2] = a[i + 3] = c;
for (; i < n; ++i)
a[i] = c;
}

评测结果