题解列表

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简单易懂 递归

```c#includevoidrec(inta[],inti,intn){intj,k,t,x;if(n!=i){k=i;for(j=k;ja[j])k=j;if(i!=k){t=a[i];a[i]=a[k];a[k]=t;}printf("swap(a[%d],