foo.cc: In function 'int main()':
foo.cc:30:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int j=0;j<n2;j++)
  ^~~
foo.cc:32:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   printf("\n");
   ^~~~~~
foo.cc:19:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&n1,&n2,&n3);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:21:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a1[i]);
   ~~~~~^~~~~~~~~~~~~
foo.cc:23:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a2[i]);
   ~~~~~^~~~~~~~~~~~~
foo.cc:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a3[i]);
   ~~~~~^~~~~~~~~~~~~
foo.cc: In function 'int Insert(int*, int, int)':
foo.cc:10:5: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[y]=x;
     ^
foo.cc: In function 'int main()':
foo.cc:10:5: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[y]=x;
     ^
foo.cc:4:6: note: 'y' was declared here
  int y;
      ^
foo.cc:10:5: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[y]=x;
     ^
foo.cc:4:6: note: 'y' was declared here
  int y;
      ^

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