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Demo

Your code really runs in the sandbox and the verdict is real. Nothing is locked, and solving this cannot unlock anything.

Get the real thing →

Try it

Arm a timer. See what happens when it fires.

On a real install this would be twenty-five minutes and it would take your whole screen. Here it is eight seconds and it takes this page — enough to show you the shape of the thing.

The problem you get is deliberately winnable the wrong way: the obvious nested loop is correct, passes every test, and will not clear the gate.

Runs your code
In the same throwaway container: no network, dropped capabilities, read-only filesystem.
Times it honestly
Measured inside the container, worst case across the suite, not around the call.
Unlocks nothing
There is no session and no token. The response has nowhere to put one.