/in/foo.cc: In function 'void work()':
/in/foo.cc:37:3: error: expected ';' before 'for'
   for (int l=e[i].x;f[l]!=j;) {l=f[l]; f[l]=j;}
   ^~~
/in/foo.cc:37:23: error: 'l' was not declared in this scope
   for (int l=e[i].x;f[l]!=j;) {l=f[l]; f[l]=j;}
                       ^
/in/foo.cc:37:29: error: expected primary-expression before ')' token
   for (int l=e[i].x;f[l]!=j;) {l=f[l]; f[l]=j;}
                             ^