/in/foo.cc: In function 'int main()':
/in/foo.cc:24:26: warning: iteration 10000 invokes undefined behavior [-Waggressive-loop-optimizations]
             len[j]&=fea[j];
                          ^
/in/foo.cc:23:22: note: within this loop
         for(int j=0;j<=10000;j++)
                     ~^~~~~~~
/in/foo.cc:10:16: warning: iteration 10000 invokes undefined behavior [-Waggressive-loop-optimizations]
         len[i] = 1;
         ~~~~~~~^~~
/in/foo.cc:9:18: note: within this loop
     for(int i=0;i<=10000;i++) {
                 ~^~~~~~~