/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=1;i<=n;i++)
  ^~~
/in/foo.cc:9:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   int a,b;
   ^~~
/in/foo.cc:25:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(shang>=5&&xia<5||shang<5&&xia>=5);
      ~~~~~~~~^~~~~~~
/in/foo.cc:29:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(zuo>=5&&you<5||zuo<5&&you>=5);
      ~~~~~~^~~~~~~
/in/foo.cc:33:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(zs>=5&&yx<5||zs<5&&yx>=5);
      ~~~~~^~~~~~
/in/foo.cc:37:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(zs>=5&&ys<5||zs<5&&ys>=5);
      ~~~~~^~~~~~