first 7 Introductory problems

CSES - CSES Problem Set/Number_Spiral.cpp

@@ -0,0 +1,27 @@
+//  Number Spiral
+
+#include<bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    int t; cin >> t;
+    for (int i{}; i < t; i++) {
+        ll x, y;
+        cin >> y >> x;
+
+        if (y >= x) {
+            ll yy = y * (y-1) + 1;
+            if (y & 1) yy -= (y - x);
+            else yy += (y - x);
+            cout << yy << endl;
+        } else {
+            ll xx = x * (x - 1) + 1;
+            if (x & 1) xx += (x - y);
+            else xx -= (x - y);
+            cout << xx << endl;
+        }
+    }
+     return 0;
+}