foo.cc: In function 'int main()':
foo.cc:7:17: warning: unused variable 'e' [-Wunused-variable]
  int n1,n2,n3,i,e;
                 ^
foo.cc: In function 'int Insert(int, int, int*)':
foo.cc:39:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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