added solution1

Author: omicoded19

.DS_Store

@@ -0,0 +1,24 @@
+#include<iostream>
+#include<cmath>
+#include<algorithm>
+using namespace std;
+int main(){
+    int t; cin>>t;
+    while(t--){
+        long long a,b,c;
+        cin>>a>>b>>c;
+        long long diff=abs(a-b);
+        long long cir=2*diff;
+        if(a>cir||b>cir||c>cir){
+            cout<<-1<<endl;
+        }
+        else if(c<=diff){
+            cout<<c+diff<<endl;
+        }
+        else{
+            cout<<c-diff<<endl;
+        }
+
+    }
+    return 0;
+}