foo.cc: In function ‘bool build(int)’:
foo.cc:29:1: warning: no return statement in function returning non-void [-Wreturn-type]
   29 | }
      | ^
foo.cc: In function ‘void sol()’:
foo.cc:53:21: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
   53 |                     if(l[j][m]==1)
      |                     ^~
foo.cc:55:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
   55 |                         if(count>6)
      |                         ^~

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