/in/foo.cc: In function 'int main()':
/in/foo.cc:29:16: warning: overflow in implicit constant conversion [-Woverflow]
         temp = 0x7f7f7f7f7f;
                ^~~~~~~~~~~~
/in/foo.cc:30:15: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if (br>=bl & cr>=cl) {temp=b[bl]+c[cl];flag=1;}
             ~~^~~~
/in/foo.cc:16:18: warning: iteration 20003 invokes undefined behavior [-Waggressive-loop-optimizations]
         while(a[i])
               ~~~^
/in/foo.cc:15:14: note: within this loop
     for(i=1;i<=N;i++)
              ^
/in/foo.cc:40:9: warning: 'flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if (flag==3)
         ^~