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struct st{
int id;
unsigned int num;
float price;
char str[15];
double total;
}
stuct st_map{
int num;
unsigned int len1;
unsigned int addr1;
unsigned int len2;
unsigned int addr2;
//...
}
stuct st_map{
int num;
unsigned int len1;
unsigned int addr1;
unsigned int len2;
unsigned int addr2;
//...
}