/in/foo.cc: In function 'int main()':
/in/foo.cc:16:12: warning: iteration 100 invokes undefined behavior [-Waggressive-loop-optimizations]
    f[i][i] = 0;
    ~~~~~~~~^~~
/in/foo.cc:11:16: note: within this loop
   for(i = 0; i < 1000; i++) {
              ~~^~~~~~
/in/foo.cc:13:17: warning: iteration 100 invokes undefined behavior [-Waggressive-loop-optimizations]
     eages[i][j] = INF;
     ~~~~~~~~~~~~^~~~~
/in/foo.cc:12:17: note: within this loop
    for(j = 0; j < 1000; j++) {
               ~~^~~~~~