foo.cc: In function 'int main()':
foo.cc:8:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    8 |     for(int i=1;i<=2*n-1;i+=2)
      |     ^~~
foo.cc:10:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   10 |  cout<<fixed<<setprecision(6)<<sum;
      |  ^~~~

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