动态分配内存，可根据输入设置数组大小

#include <stdio.h>
#include <iostream>
#include <algorithm>
using namespace std;
void sort(int *score, int *id, int n);
int main()
{
int n, *id, *score;
printf("Input number:\n");
scanf("%d", &n);
id = (int *)malloc(sizeof(int)*n);
score = (int *)malloc(sizeof(int)*n);
printf("Input number, score:\n");
for (int i = 0; i < n; i++)
{
printf("第%d个学生：", i + 1);
scanf("%d %d", id + i, score + i);
}
sort(score, id, n);
printf("排序后：\n");
for (int i = 0; i < n; i++)
{
printf("第%d个学生", i + 1);
printf("id:%d\tscore:%d\n", *(id + i), *(score + i));
}
return 0;
}
void sort(int *score, int *id, int n)
{
int i, j, k;
for(i = 0; i < n-1; i++)
{
k = i;
for(j = k+1; j < n; j++)
{
if(score[j] > score[k])
k = j;
}
if(k != i)
{
swap(score[i], score[k]);
swap(id[i], id[k]);
}
}
}