PAT Grade A skill points

PAT diary

1. If there are more than one that needs to be sorted

bool cmp1(s s1,s s2)
{
	return s1.score == s2.score ?  s1.id < s2.id : s1.score > s2.score;
}

2. The erase method of string

string str = "hello c++! +++";
// 删除"+++"前的一个空格
str.erase(str.begin()+10);
cout << '-' << str << '-' << endl;
// 删除"+++"
str.erase(str.begin() + 10, str.end());
cout << '-' << str << '-' << endl;
return 0;