Prevent easy solution via calculating sum in int.

homework/01/1-numbers/numbers.cpp

@@ -66,4 +66,5 @@ int main() {
     assert(testAddition({8,7},{4,5},{1,3,2})); // 87 + 45 = 132
     assert(testAddition({9,9,9,9},{1},{1,0,0,0,0})); // 9999 + 1 = 10000
     assert(testAddition({1},{9,9,9,9},{1,0,0,0,0})); // 1 + 9999 = 10000
+    assert(testAddition({1},{9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9},{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}));
 }