The keys to 100 locks are messed up. What is the maximum number of trials to ensure that each lock has its own key?
100把锁的钥匙搞乱了，为了确保每把锁都配上自己的钥匙，至多要试多少次．
<gadget id="calculator">99 + 1</gadget>
<output>100</output>

<gadget id="calculator">99 / 2</gadget>
<output>99/2 = around 49.5</output>

<gadget id="calculator">100 * (99/2)</gadget>
<output>4_950</output>

<result>4_950</result>