The PDF version of this problem can be downloaded here.
Warn: 本題有 specialjudge
2 4 3 0 3 2 3 3 0 3 4 5 200 1 2 0 1 2 3
1 2 Mission Impossible 1 2 4 3
In the second sample, no matter which button the hero pressed first, the button would always pop up before he press the other button. So there is no way to make all
the button pressed down.
Migrated from old NTUJ.
ACM ICPC Dalian 2011
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