用一维数组的思想来处理二维数组

因为二维数组各行之间在内存中的存放也是连续的，故也可以当作一维数组处理。

//
//  Created by louyu on 2018/12/20.
//  Copyright © 2018 louyu. All rights reserved.
//

#include <stdio.h>
void print(double *p,int i)
{
    int j;
    for (j=0; j<5; j++)
    {
        printf("%.0lf",*(p+5*i+j));
        if(j!=4) printf(" ");
    }
    printf("\n");
}
int main()
{
    int i,j,sum=0;
    double *p;
    double score[10][5]={
        80,81,83,93,90,
        75,75,88,90,99,
        22,57,78,21,66,
        52,56,12,78,75,
        35,32,85,50,98,
        24,69,98,80,82,
        84,41,42,75,95,
        98,99,90,95,96,
        60,65,70,40,20,
        66,77,88,99,88
    };
    p=*score;
    printf("排序前学生成绩为：\n");
    for (i=0; i<10; i++)
    {
        for (j=0; j<5; j++)
        {
            printf("%.0lf",*(*(score+i)+j));
            if(j!=4) printf(" ");
        }
        printf("\n");
    }
    double score_ave[10];
    for (i=0; i<50; i++)
    {
        sum+=*p;
        p++;
        if((i+1)%5==0)
        {
            score_ave[(i+1)/5-1]=sum/5;
            sum=0;
        }
    }
    printf("均分从大到小排序后的成绩为：\n");
    double max=score_ave[0];
    int max_index=0;
    for (i=0; i<10; i++)
    {
        for (j=1; j<10; j++)
        {
            if(max<score_ave[j])
            {
                max=score_ave[j];
                max_index=j;
            }
        }
        print(*score,max_index);
        score_ave[max_index]=0;
        max=score_ave[0];
        max_index=0;
    }
    return 0;
}