用C语言编写一个排列组合的程序答:include<stdio.h> int a[5];int len1,len2,len3;void input(int len1,int len2,int len3){ printf("%d %d %d\n",a[len1],a[len2],a[len3]);} void solve(int len1,int len2,int len3){ input(len1,len2,len3);if(len1==2) return;if(len3<4) len3++;else if(...