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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long ll;
- int main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(0);
- cout.tie(0);
- int t;
- cin >> t;
- for(int z = 0; z < t; ++z){
- int n;
- cin >> n;
- int a = 0;
- int b = 1e9;
- if(n == 1){
- cout << 0 << endl;
- continue;
- }
- for(int i = 0; i < n; ++i){
- int v, u;
- cin >> v >> u;
- a = max(a, v);
- u = min(b, u);
- }
- cout << max(a, b) - min(a, b) << endl;
- }
- }
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