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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ms(s,n) memset(s,n,sizeof(s))
  5. #define all(a) a.begin(),a.end()
  6. #define present(t, x) (t.find(x) != t.end())
  7. #define sz(a) int((a).size())
  8. #define FOR(i, a, b) for (int i = (a); i < (b); ++i)
  9. #define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
  10. #define pb push_back
  11. #define pf push_front
  12. #define fi first
  13. #define se second
  14. #define mp make_pair
  15.  
  16. typedef long long ll;
  17. typedef unsigned long long ull;
  18. typedef long double ld;
  19. typedef pair<int,int> pi;
  20. typedef vector<int> vi;
  21. typedef vector<pi> vii;
  22.  
  23. const int MOD = (int) 1e9+7;
  24. const int INF = (int) 1e9+1;
  25. inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
  26. inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
  27.  
  28.  
  29. int main(){
  30. #ifndef ONLINE_JUDGE
  31. freopen("input.txt", "r", stdin);
  32. freopen("output.txt", "w", stdout);
  33. #endif
  34. int t; cin >> t;
  35. while(t--){
  36. int n; cin >> n;
  37. int sum = 0;
  38. for(int i = 0; i < n - 1; i++){
  39. int x; cin >> x;
  40. sum += x;
  41. }
  42. cout << 1ll* n * (n + 1) / 2 - sum << endl;
  43. }
  44. return 0;
  45. }
  46.  
Success #stdin #stdout 0.01s 5700KB
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