foo.c: In function 'f':
foo.c:4:20: warning: unused variable 't' [-Wunused-variable]
  int i,j,s=0,min,m,t;
                    ^
foo.c:4:18: warning: unused variable 'm' [-Wunused-variable]
  int i,j,s=0,min,m,t;
                  ^
foo.c:4:14: warning: unused variable 'min' [-Wunused-variable]
  int i,j,s=0,min,m,t;
              ^~~
foo.c:4:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,s=0,min,m,t;
        ^
foo.c:4:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j,s=0,min,m,t;
      ^
foo.c: In function 'main':
foo.c:20:8: warning: unused variable 's' [-Wunused-variable]
  int n,s,i,j,t,max,a[20];
        ^

自豪的采用jd5进行评测(github.com/masnn/jd5)