Weird input

Closestsum.cpp

@@ -0,0 +1,53 @@
+#include <bits/stdc++.h>
+using namespace std;
+#define ll long long
+#define ld long double
+#define FOR(i,a,b) for(int i = a;i<b;i++)
+#define INF (unsigned)!((int)0)
+#define mp make_pair
+#define pb push_back
+#define ff first
+#define ss second
+#define lb lower_bound
+#define ub upper_bound
+#define endl "\n"
+const int NIL = -1; typedef pair<int, int> pii; typedef pair<ll, ll> pl;
+typedef vector<int> vi; typedef vector<ll> vl; typedef vector<pii> vpii;
+typedef vector<pl> vpl; typedef vector<vi> vvi; typedef vector<vl> vvl;
+//  kattis <Closest Sums> question
+void solve(){
+}
+int main () {  
+  ios_base::sync_with_stdio(0);cin.tie(0);
+ int count = 1, n;
+ while(cin>>n && n != 0){
+	int a[n];
+	for(int i = 0;i<n;++i){
+		cin>>a[i];
+	}
+	int m ;cin>>m;
+	// from each query find the two numbers which summed,
+	// give the closest to q,get min abs(a[i] + a[j]) - query)
+	int ans;
+	cout<<"Case "<<count<<':'<<endl;
+	for(int i =0 ;i<m;++i){
+		int x;cin>>x;
+	ans = INT_MAX;
+		for(int j = 0 ;j<n;j++){
+			for(int k = j+ 1;k<n;k++){
+				if(abs((a[j] + a[k]) - x) < abs(x - ans)){
+					ans = (a[j] + a[k]);
+				}
+			}
+		}
+		cout<<"Closest sum to "<<x<<" is "<<ans<<'.'<<endl;
+	}
+	count++;
+}	
+
+return 0;
+}
+
+
+
+