入门题求助

#include<iostream>
#include<cstdio>
#include<cstring>

using namespace std;

const int maxn = 1e5+10;
int l,r,lst;
int a[maxn]; 
int T,n;

int main()
{
	//freopen("data.in","r",stdin);
	cin >> T;
	for(; T ; T--)
	{
		r=l=0; lst=0;
		memset(a,0,sizeof(a));
		cin >> n;
		for(int i = 1;i <= n;i++)
		{
			int x;
			cin >> x;
			if(x != -1)
			{
				r = x;
				int sum = r - l;
				for(int k = lst+1; k < i ; k++)
				{
					sum-=1; a[k]=1;
				}
				a[i]=sum; lst=i; l=x;
			}
		}
		if(lst != n)
		{
			for(int i=lst+1; i<=n; i++)
			{
				a[i]=1;
			}
		}
		for(int i=1;i<=n;i++)
		{
			cout<<a[i]<<" ";
		}
		cout<<'\n';
	}
	
	
	
	return 0;
}