Wrong Answer
foo.cc: In function 'int main()':
foo.cc:20:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
20 | else f=false; break;
| ^~~~
foo.cc:20:19: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
20 | else f=false; break;
| ^~~~~
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