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View Compilation Error

0_0_14530259_10490.cpp: In function 'int BSGS(int, int, int)':
0_0_14530259_10490.cpp:38:13: error: 'head' was not declared in this scope
      memset(head,-1,sizeof(head));
             ^
0_0_14530259_10490.cpp: In function 'int main()':
0_0_14530259_10490.cpp:79:9: error: 'd' was not declared in this scope
         d = gcd(ans1,p);
         ^


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