Q1 day1 solved

Author: Aiyaan-Mahajan

.DS_Store

@@ -0,0 +1,43 @@
+/*We have:
+
+An even number of people n standing in a circle, numbered 1 to n clockwise.
+
+Each person looks directly opposite in the circle.
+
+You are given three numbers: a, b, c.
+
+a is looking at b.
+
+We want to know who c is looking at.
+
+If no circle is possible → return -1.
+
+*/
+
+typedef long long ll;
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+	int t;
+	cin>>t;
+	while(t--){
+	   ll a, b, c;
+        cin >> a >> b >> c;
+
+        ll diff = abs(a - b);
+        ll n = 2 * diff;
+
+        if (diff==0 || max({a,b,c})> n){
+            cout << -1 << endl;
+        } else {
+            ll d = c + diff;
+            if (d > n) d -= n;
+            cout << d << endl;
+	}
+	}
+  return 0;
+}
+
+//O(1) per test case
+//My SUBMISSION : https://codeforces.com/contest/1560/submission/355307599