Error in program (COPS)

plz help me figure out where i am doing mistake,the submission queue is showing runtime error
problem code:COPS
https://www.codechef.com/viewsolution/28407439

The sample testcase causes an out-of-bounds write at line 27 (Update - or maybe not):

for(k=a-c-1;k<a+c;k++)
           cop[k]=1;

Edit:

And also line 20 (Update - this is definitely causing a problem):

for(k=0;k<a+c;k++)
         cop[k]=1;
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Got it thank u sir…

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