D - Moderate Modular Mode

https://codeforces.com/contest/1604/submission/133681028

CodeForces/1604/D/D.cpp

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+#include <bits/stdc++.h>
+
+using namespace std;
+
+int t, x, y;
+
+int main() {
+    cin >> t;
+    while (t--) {
+        cin >> x >> y;
+        if (x > y) {
+            cout << x + y << endl;
+        } else if (x == y) {
+            cout << x << endl;
+        } else {
+            cout << y - (y % x / 2) << endl;
+        }
+    }
+    return 0;
+}