c语言代码解决问题

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

#define maxsize 100000

typedef struct

{

char id[19];

char age[9];

}people;

int compare(const void* a, const void* b)

{

people* A = (people*)a;

people* B = (people*)b;

if (strcmp(A->age, B->age) != 0)

return strcmp(B->age, A->age);

else

return strcmp(B->id, A->id);

}

int main()

{

int i, n,j;

scanf("%d", &n);

people *x;

x = (people*)malloc(sizeof(people) * n);

if (x == NULL)

return 0;

for (i = 0; i < n; i++)

scanf("%s",x[i].id);

for (i = 0; i < n; i++)

{

for (j = 0; j <=7;j++)

{

x[i].age[j] = x[i].id[j + 6];

}

x[i].age[j] = '\0';

}

qsort(x, n, sizeof(people), compare);

for (i = 0; i < n; i++)

printf("%s\n", x[i].id);

return 0;

}