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- #include<bits/stdc++.h>
- #define N 1005
- using namespace std;
- int n,v[N],k;
- int main()
- {
- int s=0;
- cin>>n;
- for(int i=1; i<=n; i++)
- cin>>v[i];
- cin>>k;
- sort(v+1,v+n+1);
- for(int i=1;i<=k;i++)
- v[i]=-v[i];
- for(int i=1;i<=n;i++)
- s+=v[i];
- cout<<s;
- return 0;
- }
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