foo.cc: In function 'int check(int)':
foo.cc:11:53: warning: unused variable 't' [-Wunused-variable]
   11 |  int k=4,now_ice=50,will_ice=0,now_gas=0,will_gas=0,t=0,free=0,now_robot=0,will_robot=4,nowtime=0;
      |                                                     ^
foo.cc:47:1: warning: control reaches end of non-void function [-Wreturn-type]
   47 | }
      | ^

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