foo.cc: In function 'int main()':
foo.cc:30:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   30 |     if(it->second!=0)
      |     ^~
foo.cc:32:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   32 |         if(it==L1.begin()) break;
      |         ^~

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