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- #include <bits.stdc++.h>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- FOR(i,1,n) cin>>a[i].first;
- FOR(i,1,n) cin>>a[i].second;
- FOR(i,1,n) cin>>b[i].first;
- FOR(i,1,n) cin>>b[i].second;
- sort(a+1,a+1+n);
- sort(b+1,b+1+n);
- FOR(i,1,n) if (a[i]<b[i]) cout<<"IMPOSSIBLE";
- return;
- }
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