#include<stdio.h> using namespace std; #include<vector> #include<algorithm> struct student { int grade; int id; }; //改写比较规则 bool compare(student l, student r) { //l.grade<r.grade不用交换 //l.grade=r.grade,且l.id<r.id不用交换 if (l.grade < r.grade) { return true; } else if (l.grade ...