foo.cc: In function 'int main()':
foo.cc:57:25: error: 'n12' was not declared in this scope; did you mean 'n2'?
   57 |         for(int i=1; i<=n12; i++)
      |                         ^~~
      |                         n2
foo.cc:60:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   60 |         if(m1>=m2)
      |         ^~
foo.cc:62:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   62 |                 output(a1,m);
      |                 ^~~~~~
foo.cc:63:9: error: 'else' without a previous 'if'
   63 |         else
      |         ^~~~

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