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oh thanks... i had misunderstood it |
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in problem B, the tutorial assumes that the left steps will always be accompanied by right steps as they have been taken in pairs but it may so happen that the last step will be a left step, so in that case the tutorial fails and so does the solution in the following test case 18 11 4 11 19 18 19 19 5 14 15 17 4 10 9 8 17 9 2 15 10 |
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