foo.cc: In function 'int unionSet(int*, int, int*, int, int*)':
foo.cc:56:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(flag==0)
   ^~
foo.cc:58:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    n3++;
    ^~
foo.cc: In function 'int main()':
foo.cc:64:15: warning: unused variable 'i' [-Wunused-variable]
  int n1,n2,n3,i; 
               ^

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