/in/foo.c: In function 'main':
/in/foo.c:13:45: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations]
   13 |                         trans[j][i] = arr[i][j];
      |                                       ~~~~~~^~~
/in/foo.c:11:27: note: within this loop
   11 |         for (int i = 0; i < 3; i++) {
      |                         ~~^~~