foo.cc: In function 'int main()':
foo.cc:23:11: warning: unused variable 's' [-Wunused-variable]
     int m,s,a[N],max,t=0;
           ^
foo.cc:23:13: warning: unused variable 'a' [-Wunused-variable]
     int m,s,a[N],max,t=0;
             ^
foo.cc:23:18: warning: unused variable 'max' [-Wunused-variable]
     int m,s,a[N],max,t=0;
                  ^~~
foo.cc:23:22: warning: unused variable 't' [-Wunused-variable]
     int m,s,a[N],max,t=0;
                      ^

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