/in/foo.cc: In function 'int main()':
/in/foo.cc:37:49: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
                     vis[dx][dy][t.f | a[dx][dy] == 'P'] = 1;
                                       ~~~~~~~~~~^~~~~~
/in/foo.cc:38:59: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
                     q.push({dx,dy,t.num+1,t.f | a[dx][dy] == 'P'});
                                                 ~~~~~~~~~~^~~~~~