/in/foo.cc: In function 'int main()':
/in/foo.cc:11:25: warning: iteration 10005 invokes undefined behavior [-Waggressive-loop-optimizations]
         f[j][0]=f[j][10]=0x3f3f3f3f;
                 ~~~~~~~~^~~~~~~~~~~
/in/foo.cc:10:19: note: within this loop
     for (int j=0;j<=10005;j++) {
                  ~^~~~~~~
/in/foo.cc:11:24: warning: array subscript is above array bounds [-Warray-bounds]
         f[j][0]=f[j][10]=0x3f3f3f3f;
                 ~~~~~~~^