#include <bits/stdc++.h> using namespace std; #define ms(s,n) memset(s,n,sizeof(s)) #define all(a) a.begin(),a.end() #define present(t, x) (t.find(x) != t.end()) #define sz(a) int((a).size()) #define FOR(i, a, b) for (int i = (a); i < (b); ++i) #define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i) #define pb push_back #define pf push_front #define fi first #define se second #define mp make_pair typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef pair<int,int> pi; typedef vector<int> vi; typedef vector<pi> vii; const int MOD = (int) 1e9+7; const int INF = (int) 1e9+1; inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;} inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;} int main(){ #ifndef ONLINE_JUDGE freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); #endif int t; cin >> t; while(t--){ int n; cin >> n; int sum = 0; for(int i = 0; i < n - 1; i++){ int x; cin >> x; sum += x; } cout << 1ll* n * (n + 1) / 2 - sum << endl; } return 0; }
Standard input is empty
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