[Init] Solved solutions

cpp/69A.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int n, x, y, z;
+    cin >> n;
+    x = y = z = 0;
+    for (int i = 0; i < n; i++)
+    {
+        int t;
+        cin >> t;
+        x += t;
+        cin >> t;
+        y += t;
+        cin >> t;
+        z += t;
+    }
+    if (x == 0 && y == 0 && z == 0)
+    {
+        cout << "YES";
+    }
+    else
+    {
+        cout << "NO";
+    }
+    return 0;
+}