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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- ll n,m,i,j,k,l;
- while(cin>>n && n)
- {
- l=0;
- multiset<ll>a;
- multiset<ll>::iterator lo,hi;
- while(n--)
- {
- cin>>k;
- while(k--)
- {
- cin>>m;
- a.insert(m);
- }
- lo=a.begin();
- hi=a.end();
- --hi;
- l+=(*hi-*lo);
- a.erase(a.find(*hi));
- a.erase(a.find(*lo));
- }
- cout<<l<<endl;
- }
- return 0;
- }
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