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1833 为什么会超时,请寻位大侠帮忙解释下,贴上我的代码#include <iostream>
#include<algorithm>
using namespace std;
int main()
{
int a[1024];
int m,n,k,ii=0;
int i,j;
cin>>m;
while(m-->0)
{
cin>>n>>k;
for(j=0; j<n;j++)
{
cin>>a[j];
}
if(n==1) { cout<<1<<endl; continue;}
if(n==3) k=k%6;
if(n==2) k=k%2;
while(k>0) //计算下k个排列数
{
for(i=n-1;i>0;i--)
if(a[i-1]<a[i]) break;
if(i>0)
{
int pos=i;
for(j=i+1;j<n;j++)
{ if(a[j]>a[i-1])
{
if(a[j]<a[pos]) pos=j;
}
else break;
}
swap(a[i-1],a[pos]);
}
sort(a+i,a+n);
if(n-i>=4)
{
if(k>=24) { k=k-24; swap(a[n-4],a[n-1]);swap(a[n-3],a[n-2]);}
else if(k>=6){ k=k-6;swap(a[n-1],a[n-3]);}
else if(k>=2){ k=k-2;swap(a[n-1],a[n-2]);}
else k--;
}
else if(n-i==3)
{
if(k>=6){k=k-6;swap(a[n-1],a[n-3]);}
else if(k>=2) {k=k-2;swap(a[n-1],a[n-2]);}
else k--;
}
else if(n-i==2)
{
if(k>=2) {k=k-2;swap(a[n-1],a[n-2]);}
else k--;
}
else k--;
}
for(j=0;j<n;j++)
{
cout<<a[j]<<" ";
}
cout<<endl;
}
return 0;
}
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