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I saw some author use 62kb to solve the problem.
but if i commint a simpe source,it use 100kb+memory.
how can those people do that?

It's a glitch, especially when they solve it in 0 secs. Something is weird there, my Java solutions use either 64k or 2.5MB and more. Sometimes both amounts are reported for different submissions of the same code.

Darko