foo.cc: In function 'int main()':
foo.cc:56:37: warning: 'rey' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << rex + 1 << ' ' << rey + 1;
                                     ^
foo.cc:56:24: warning: 'rex' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << rex + 1 << ' ' << rey + 1;
                        ^~~

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