foo.cc: In function 'int main()':
foo.cc:10:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   10 |     for(int i=2;i<=2*n;i++)
      |     ^~~
foo.cc:13:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   13 |         for(int i=1;i<=2*n;i++)
      |         ^~~

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