Problem with pairs

[mamhh]

hi all ,
i have a problem when i sort a vector of pairs

vector<pair<double,string> > v;
//consider the vector contains the following 
//{  0.625 ,  0.5   , 0.5714 ,  0.5714 ,  0.6   ,  0.4    }
//{"BEARS","GIANTS","COWBOYS","BRONCOS","DOLPHINS","LIONS"}
sort(v.begin(),v.end());
reverse(v.begin(),v.end());
//the expected list of strings should be : {"BEARS", "DOLPHINS", "BRONCOS", "COWBOYS", "GIANTS", "LIONS" }
//but i get {"BEARS", "DOLPHINS", "COWBOYS" ,"BRONCOS", "GIANTS", "LIONS" }

so, i really need help to figure out where is the bug

[leppyr64]

There is no bug. The problem is in how you define ordering for pair. If you want to order it in a specific way, other than the default, you need to define a method of comparison.

cplusplus.com/reference/algorithm/sort/