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用了个dfs……LTE……请路过的建议一个好的剪枝#include<iostream>
#include<stack>
using namespace std;
void dfs(int);
int n;
int* a;
stack<int> s;
int count=0;
int best_c=0;
int main()
{
cin>>n;
int i;
a=new int[n];
for(i=0;i<n;i++)
{
cin>>a[i];
}
dfs(0);
cout<<best_c<<endl;
delete [] a;
return 0;
}
void dfs(int i)
{
if(i==n)
{
if(s.size()>best_c) best_c=s.size();
return;
}
if(s.empty()||a[i]>s.top())
{
s.push(a[i]);
dfs(i+1);
s.pop();
}
if(s.size()+n-i-1>best_c) dfs(i+1);
}
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