/in/foo.cc: In function 'int main()':
/in/foo.cc:22:20: error: 'cmp_se_1' was not declared in this scope
     sort(a+1,a+t+1,cmp_se_1);
                    ^~~~~~~~
/in/foo.cc:30:34: error: 'l' was not declared in this scope
         ans=min(ans,(double(n+m)*l)-(double(f[i])*(2-sqrt(2))*l));
                                  ^