This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
#define endl '\n'
#define pb push_back
using namespace std;
const ll mx=1007, INF=1e18L+5;
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll n,m,k;
cin>>n>>m>>k;
ll arr[n];
for(int i=0;i<n;i++)cin>>arr[i];
deque<ll>dq(m);
ll sum=0;
for(int i=0;i<m;i++)
{
cin>>dq[i];
sum+=dq[i];
}
for(int i=0;i<n;i++)
{
ll s=arr[i];
while(arr[i]!=0)
{
if(dq.size()==0)
{
cout<<"Impossible";
return 0;
}
ll x=dq.front();
if(arr[i]>=x)
{
arr[i]-=x;
dq.pop_front();
}
else
{
dq[0]-=arr[i];
arr[i]=0;
}
}
sum-=s;
}
cout<<sum;
return 0;
}
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