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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=1e9+7;
  5. const ll INF = 10000000000000;
  6. const int N = 1e6+7;
  7.  
  8.     void solve() {
  9.         int n;
  10.         cin >> n;
  11.         vector<pair<int,int>> a(n);
  12.         for(int i=0;i<n;i++) cin >> a[i].first;
  13.         for(int i=0;i<n;i++) cin >> a[i].second;
  14.         vector<int> ch(n);
  15.         for(int i=0;i<n;i++) ch[i]=a[i].first-a[i].second;
  16.         sort(ch.begin(),ch.end());
  17.         int l=0,r=n-1;
  18.         int ans = 0;
  19.         while(l<=r){
  20.            if(ch[l]+ch[r]>0){
  21.               ans+=r-l;
  22.               r--;  
  23.            }
  24.            else l++;
  25.         }
  26.         cout << ans << '\n';
  27.     }
  28.  
  29. int main(){ 
  30.     ios::sync_with_stdio(false);
  31.     cin.tie(nullptr);
  32.  
  33.     /*int t;
  34.     cin >> t;
  35.     while (t--)*/ solve();
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/T6OSoU
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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