[Solution Link](http://codeforces.com/contest/148/submission/29524381)↵
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It Says "Compilation process returned error: execution failed because of unknown invocation error".<br>↵
It Says "Compilation process returned error: execution failed because of unknown invocation error".↵
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**Edit**:<br>↵
[Editorial Solution Link](http://codeforces.com/contest/148/submission/29525256)<br>↵
This also gives the same verdict. O.o↵
↵
It Says "Compilation process returned error: execution failed because of unknown invocation error".
It Says "Compilation process returned error: execution failed because of unknown invocation error".↵
↵
**Edit**:<br>↵
[Editorial Solution Link](http://codeforces.com/contest/148/submission/29525256)<br>↵
This also gives the same verdict. O.o↵