题目内容:
停车场模拟:利用栈实现单道停车场,也就是该停车场先进来的车只能最后出,如果某辆车想出车道,必须先把其前面的车先退出栈,等该车开走,再将之前的车压入栈。
输入文件如附件文件中data.txt所示,其中格式如:“COOLONE arrives”,表示COOLONE的车到达;输出如文件outpu.txt所示,其中格式为:“COOLONE was moved 0 times while it was here”,表示该车在离开之前没有移动过。
思路分析:
单道停车场,存在着挪车回原位的过程,如果多一个挪车场(假想)会更方便操作,所以本题采用的解法是双栈法。
注意:思路和代码仅供借鉴,此贴只作纪念
核心代码如下:
# include
# include
# include
// 函数结果状态代码
# define TRUE 1
# define FALSE 0
# define OK 1
# define ERROR 0
# define INFEASIBLE -1
# define OVERFLOW -2
# define MAXSIZE 5 //总共的车位数
#define BUFF_LEN 1024 //每行的长度均为15 前7个字符是汽车牌
//Status 是函数的类型,其值是函数结果状态代码
typedef int Status;
typedef char SElemType;
//车
typedef struct {
char name[8];
int movedtime; //移动次数
}Car;
//停车场 //这里采用顺序栈实现
typedef struct {
Car* base; //栈底指针
Car* top; //栈顶指针
int stackSize; //栈可用的最大容量
}P_SqStack;
Status initParkLot(P_SqStack *p); //创建停车场或临时车场
Status initCar(Car* car); //初始化汽车
Car Pop(P_SqStack *p); //弹出停车场的车或者弹出临时车场的车,并返回汽车
Status Push(P_SqStack *p, Car car); //把车停入停车场或临时车场
char * left(char *dst, char *src, int n); //从字符串的左边截取n个字符
//创建停车场或临时车场
Status initParkLot(P_SqStack *p) {
p->base = (Car*)malloc(MAXSIZE * sizeof(Car));
if (!p ->base) {
exit(OVERFLOW);
}
p->top = p->base; //栈顶指针指向栈底指针
p->stackSize = MAXSIZE;
return OK;
}
//汽车的初始化
Status initCar(Car* car) {
for(int i=0;i<8;i++){
car->name[i] ="";
}
car->movedtime = 0;
return OK;
}
//弹出停车场的车或者弹出临时车场的车,并返回汽车
Car Pop(P_SqStack *p) {
Car car;
//关于栈空的判断,写在了主函数里面
p->top--;
car = *p->top;
return car;
}
//把车停入停车场或临时车场
Status Push(P_SqStack *p, Car car) {
*p->top = car;
p->top++;
return OK;
}
//p->top = (Car*)malloc(sizeof(Car)); //这里绝对不能分配,不然会出现冲突,因为在初始化时,top已经指向了一片空间,不能再多指向一个空间
//从字符串的左边截取n个字符
char * left(char *dst, char *src, int n)
{
char *p = src;
char *q = dst;
int len = strlen(src);
if (n > len) n = len;
while (n--) *(q++) = *(p++);
*(q++) = '\0'; //补回这个字符串的结束符,防止系统没有补'\0'导致出bug
return dst;
}
//汽车move的次数,取决于它自己离开前,在它底下的车有多少台离开了
int main() {
//创建栈结构 停车场和汽车都要创建
P_SqStack pInt;
P_SqStack pTemp;
initParkLot(&pInt);
initParkLot(&pTemp);
FILE* file;
FILE* filewrite = fopen("output.txt", "w+"); //写出到output.txt
char line[BUFF_LEN] = { 0 };
file = fopen("data.txt","r");
//IO流一行一行地读取
while (fgets(line,BUFF_LEN,file) != NULL)
{
Car car;
initCar(&car);
char temp[10] = ""; //temp[]绝不能开到[7],因为后面要补一个'\0'表示结束
if (strstr(line, "arrives")) {//有汽车到达
left(temp, line, 7);
for (int i = 0; i < 8;i++) {
car.name[i] = temp[i];
}
if ((pInt.top - pInt.base) != MAXSIZE) {
//此时停车场车位没有满
Push(&pInt, car);
}
else
{//Sorry PORSCHE, the lot is full
printf("Sorry %s, the lot is full\n", car.name);
//输出到output.txt文本文件
fprintf(filewrite, "Sorry %s, the lot is full\n", car.name);
continue;
}
}
if (strstr(line, "departs")) {
left(temp, line, 7);
//有汽车停在停车场里,才能弹出汽车
if (pInt.base != pInt.top) {
car = Pop(&pInt);
while (strcmp(car.name, temp) != 0 && pInt.base != pInt.top) {
//循环条件
//把排在要离开的车前面的所有车移入临时车场
//还要注意停车场不能为空才可以进行
car.movedtime += 1;
Push(&pTemp, car);
//继续进行挪车,用一个car来接受,便于比较
car = Pop(&pInt);
}
}
//跳出while循环时,此时car的名字就是要离开的车的名字
//COOLONE was moved 0 times while it was here
printf("%s was moved %d times while it was here\n", car.name, car.movedtime);
fprintf(filewrite, "%s was moved %d times while it was here\n", car.name, car.movedtime);
Car cartemp;
initCar(&cartemp);
//将临时车场剩余的所有汽车复原回停车场
while (pTemp.base != pTemp.top)
{
cartemp = Pop(&pTemp);
Push(&pInt, cartemp);
}
}
}
//打印出最后停留在停车场里没有出去的汽车的信息
//printStack(pInt);
while (pInt.base != pInt.top) {
pInt.top--;
printf("%s was moved %d times while it was here\n", pInt.top->name, pInt.top->movedtime);
fprintf(filewrite, "%s was moved %d times while it was here\n", pInt.top->name, pInt.top->movedtime);
}
//关闭文件流
fclose(filewrite);
return 0;
}