/in/foo.cc: In function 'int main()':
/in/foo.cc:56:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(ch=='N')
     ^~
/in/foo.cc:58:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  a[st1][st2][f[1]]=false;
  ^