代码

#include<string.h>
inline void m(int q, int* a, unsigned n) {
n&=~15;
while(n){a[0]=a[1]=a[2]=a[3]=q;n-=16;a+=4;}
}
void my_memset(char *a, char c, unsigned n) {
while(15&(int)a)*a++=c,--n;
int q=c*0x1010101;
m(q,(int*)a,n);
a[n-4]=a[n-8]=a[n-12]=a[n-16]=q;
}

评测结果