题解 | #成绩排序#

#include <iostream>
#include<string>
#include<algorithm>
using namespace std;
struct stu
{
    char *name;
    int grade;
    int order;//用于标明先后顺序
};
bool cmp_ascending(stu a,stu b)
{
    if(a.grade!=b.grade)return a.grade<b.grade;
    else return a.order<b.order;
}
bool cmp_descending(stu a,stu b)
{
    if(a.grade!=b.grade)return a.grade>b.grade;
    else return a.order<b.order;
}

int main() 
{
    int num,cmptype;
   //cout<<"test"<<endl;
    while (cin >> num >> cmptype) 
    {
        stu *a=(stu*)malloc(sizeof(stu)*(num+2));
        //cout<<sizeof(stu)<<" "<<sizeof(a)<<endl;
        for(int i=0;i<num;i++)
        {
            a[i].name=(char*)malloc(sizeof(char)*30);
            cin>>a[i].name>>a[i].grade;
            a[i].order=i+1;
            //cout<<i<<" "<<num<<endl;
        }
        if(cmptype==0)sort(a,a+num,cmp_descending);
        else sort(a,a+num,cmp_ascending);
        for(int i=0;i<num;i++)cout<<a[i].name<<" "<<a[i].grade<<endl;
    }
}
//报错原因在字符串string未初始化
// 64 位输出请用 printf("%lld")