Spoj.com problem please help me in reducing time

question https://www.spoj.com/problems/STPAR/
solution - https://www.codechef.com/viewsolution/26226767

i am getting tle everytime please help me in optimising this solution

Can you link your solution on any online ide ??

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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.

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Also there will be multiple testcase and zero will be present after only last testcase. so do take care for that. for ex :
int t;
while(scanf("%d",&t) && t!=0)
The input format seem to be mess up.
P.S : i checked your code and i guess you got logic wrong. Here’s simple explanation http://code.cloudkaksha.org/spoj/spoj-stpar-solution

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