foo.cc: In function 'int main()':
foo.cc:12:32: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   12 |                         if(i==0&&j==0 || i==0&&j==n-1 || i==m-1&&j==0 || i==m-1&&j==n-1){
      |                            ~~~~^~~~~~
foo.cc:12:64: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   12 |                         if(i==0&&j==0 || i==0&&j==n-1 || i==m-1&&j==0 || i==m-1&&j==n-1){
      |                                                          ~~~~~~^~~~~~
foo.cc:12:80: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   12 |                         if(i==0&&j==0 || i==0&&j==n-1 || i==m-1&&j==0 || i==m-1&&j==n-1){
      |                                                                          ~~~~~~^~~~~~~~

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