foo.cc: In function 'int main()':
foo.cc:18:17: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses]
     if(! g[1][1]==1 && g[n][m]==1)
                 ^~
foo.cc:18:8: note: add parentheses around left hand side expression to silence this warning
     if(! g[1][1]==1 && g[n][m]==1)
        ^~~~~~~~~
        (        )

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