done 3 sorting problems

CSES - CSES Problem Set/Introducotry_Problems/Coin_Piles.cpp

@@ -0,0 +1,23 @@
+//  Coin Piles
+
+#include<bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    int t; cin >> t;
+    for (int T{}; T < t; T++) {
+        ll a, b; cin >> a >> b;
+        if (a < b) swap(a, b);
+        if ((a + b) % 3 != 0) {
+            cout << "NO" << endl;
+            continue;
+        } else if (a > 2*b) {
+            cout << "NO" << endl;
+            continue;
+        }
+        cout << "YES" << endl;
+    }
+    return 0;
+}