/in/foo.cc: In function 'int main()':
/in/foo.cc:37:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   37 |     for(;sx!=tx&&sy!=ty;ans+=walk(sx,sy));
      |     ^~~
/in/foo.cc:38:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   38 |         ans+=abs(sx-tx)+abs(sy-ty);//不在对边上
      |         ^~~
/in/foo.cc: In function 'int walk(int&, int&)':
/in/foo.cc:31:1: warning: control reaches end of non-void function [-Wreturn-type]
   31 | }
      | ^