foo.c: In function 'main':
foo.c:8:39: warning: unused variable 'c' [-Wunused-variable]
  int a[100000]={1}, n=1,b[100000]={1},c[100000]={1}, m=1,k,o,p,q;   
                                       ^
foo.c: In function 'Add':
foo.c:45:12: warning: operation on 'i' may be undefined [-Wsequence-point]
  c[i++]=a[i++];
           ~^~
foo.c:20:10: warning: unused variable 'j' [-Wunused-variable]
  int i=0,j,jw=0,c[100000];
          ^
foo.c: In function 'main':
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&k,&o);
  ^~~~~~~~~~~~~~~~~~~
foo.c:10:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&q,&p);
  ^~~~~~~~~~~~~~~~~~~

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