foo.c: In function 'main':
foo.c:7:15: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    7 |         if (a > b > c)
      |             ~~^~~
foo.c:9:20: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
    9 |         else if (a > c > b)
      |                  ~~^~~
foo.c:13:20: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   13 |         else if (b > a > c)
      |                  ~~^~~
foo.c:17:20: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   17 |         else if (b > c > a)
      |                  ~~^~~
foo.c:21:20: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   21 |         else if (c > a > b)
      |                  ~~^~~
foo.c:25:20: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
   25 |         else if (c > b > a)
      |                  ~~^~~

[Hydro](https://hydro.ac)提供评测服务