0 求助

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
using namespace std;
int a[1000]={0};
int b[1000];
int main() 
{int n,j,ans=0;
cin>>n;
for(int i=0;i<n;i++)
{cin>>b[i];
}
a[0]=b[0];
int c=1;
for(int i=1;i<n;i++)
{
if(b[i]>a[c]) {
for(j=0;j<=c;j++)
{if(a[j]>=b[i]){a[j]=b[i];break;}
}if(a[j]==b[i]) break;
c++;a[c]=b[i];
}
else if(b[i]<=a[c])a[c]=b[i];
}
cout<<c;
}