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SPOJ 95 - STPAR - Street Parade

Problem Statement

Heuristics: 
Let, N be the number which is next in fixed order.
Take an input X, if it is equal to N then next number will be n++. If not, then search for N in the side lane and after finishing the search, put X in the side lane.
After all X is processed but N is not found in either X or side lane, then the order is not possible.
Solution:

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