网站后台策划,网站开发项目中的rd,艺商网站,牛商网抖音培训目录 一 用队列实现栈
二 用栈实现队列
三 设计循环队列
四 有效的括号 一 用队列实现栈
225. 用队列实现栈 - 力扣#xff08;LeetCode#xff09; typedef int QDataType;
typedef struct QueueNode
{struct QueueNode* next;QDataType data;
}QNode;typedef struct …目录 一 用队列实现栈
二 用栈实现队列
三 设计循环队列
四 有效的括号 一 用队列实现栈
225. 用队列实现栈 - 力扣LeetCode typedef int QDataType;
typedef struct QueueNode
{struct QueueNode* next;QDataType data;
}QNode;typedef struct Queue
{QNode* head;QNode* tail;int size;
}Que;void QueueInit(Que* pq)
{assert(pq);pq-head pq-tail NULL;pq-size 0;
}void QueueDestroy(Que* pq)
{assert(pq);QNode* cur pq-head;while (cur){QNode* next cur-next;free(cur);cur next;}pq-head pq-tail NULL;pq-size 0;
}void QueuePush(Que* pq, QDataType x)
{assert(pq);QNode* newnode (QNode*)malloc(sizeof(QNode));if (newnode NULL){perror(malloc fail);exit(-1);}newnode-data x;newnode-next NULL;if (pq-tail NULL){pq-head pq-tail newnode;}else{pq-tail-next newnode;pq-tail newnode;}pq-size;
}bool QueueEmpty(Que* pq)
{assert(pq);return pq-head NULL;
}void QueuePop(Que* pq)
{assert(pq);assert(!QueueEmpty(pq));if (pq-head-next NULL){free(pq-head);pq-head pq-tail NULL;}else{QNode* next pq-head-next;free(pq-head);pq-head next;}pq-size--;
}QDataType QueueFront(Que* pq)
{assert(pq);assert(!QueueEmpty(pq));return pq-head-data;
}QDataType QueueBack(Que* pq)
{assert(pq);assert(!QueueEmpty(pq));return pq-tail-data;
}int QueueSize(Que* pq)
{assert(pq);return pq-size;
}typedef struct {Que q1;Que q2;
} MyStack;MyStack* myStackCreate() {MyStack* pst (MyStack*)malloc(sizeof(MyStack));QueueInit(pst-q1);QueueInit(pst-q2);return pst;
}void myStackPush(MyStack* obj, int x) {if (!QueueEmpty(obj-q1)){QueuePush(obj-q1, x);}else{QueuePush(obj-q2, x);}
}int myStackPop(MyStack* obj) {Que* empty obj-q1;Que* nonempty obj-q2;if (!QueueEmpty(obj-q1)){nonempty obj-q1;empty obj-q2;}while (QueueSize(nonempty) 1){QueuePush(empty, QueueFront(nonempty));QueuePop(nonempty);}int top QueueFront(nonempty);QueuePop(nonempty);return top;
}int myStackTop(MyStack* obj) {if (!QueueEmpty(obj-q1)){return QueueBack(obj-q1);}else{return QueueBack(obj-q2);}
}bool myStackEmpty(MyStack* obj) {return QueueEmpty(obj-q1) QueueEmpty(obj-q2);
}void myStackFree(MyStack* obj) {QueueDestroy(obj-q1);QueueDestroy(obj-q2);free(obj);
}二 用栈实现队列
232. 用栈实现队列 - 力扣LeetCode typedef int STDataType;
typedef struct Stack
{STDataType* a;int top;int capacity;
}ST;void STInit(ST* ps)
{assert(ps);ps-a NULL;ps-top 0;ps-capacity 0;
}void STDestroy(ST* ps)
{assert(ps);free(ps-a);ps-a 0;ps-top ps-capacity 0;
}void STPush(ST* ps, STDataType x)
{assert(ps);if (ps-top ps-capacity){int newcapacity (ps-capacity 0 ? 4 : ((ps-capacity) * 2));STDataType* tmp (STDataType*)realloc(ps-a, sizeof(STDataType) * newcapacity);if (tmp NULL){perror(realloc fail);exit(-1);}ps-a tmp;ps-capacity newcapacity;}ps-a[ps-top] x;ps-top;
}void STPop(ST* ps)
{assert(ps);assert(ps-top 0);ps-top--;
}STDataType STTop(ST* ps)
{assert(ps);assert(ps-top 0);return ps-a[ps-top - 1];
}int STSize(ST* ps)
{assert(ps);return ps-top;
}bool STEmpty(ST* ps)
{assert(ps);return ps-top 0;
}typedef struct {ST StackPush;ST StackPop;} MyQueue;MyQueue* myQueueCreate() {MyQueue* pqueue (MyQueue*)malloc(sizeof(MyQueue));STInit(pqueue-StackPush);STInit(pqueue-StackPop);return pqueue;
}void myQueuePush(MyQueue* obj, int x) {STPush(obj-StackPush, x);
}int myQueuePeek(MyQueue* obj) {if (STEmpty(obj-StackPop)){while (!STEmpty(obj-StackPush)){STPush(obj-StackPop, STTop(obj-StackPush));STPop(obj-StackPush);}}return STTop(obj-StackPop);}int myQueuePop(MyQueue* obj) {int front myQueuePeek(obj);STPop(obj-StackPop);return front;
}bool myQueueEmpty(MyQueue* obj) {return STEmpty(obj-StackPush) STEmpty(obj-StackPop);
}void myQueueFree(MyQueue* obj) {STDestroy(obj-StackPush);STDestroy(obj-StackPop);free(obj);
}三 设计循环队列
622. 设计循环队列 - 力扣LeetCode typedef struct {int* a;int front;int rear;int k;
} MyCircularQueue;MyCircularQueue* myCircularQueueCreate(int k) {MyCircularQueue* obj (MyCircularQueue*)malloc(sizeof(MyCircularQueue));obj-a (int*)malloc(sizeof(int) * (k 1));//多开一个空间obj-front obj-rear 0;obj-k k;return obj;
}bool myCircularQueueIsEmpty(MyCircularQueue* obj) {return obj-front obj-rear;
}bool myCircularQueueIsFull(MyCircularQueue* obj) {return (obj-rear 1) % (obj-k 1) obj-front;
}bool myCircularQueueEnQueue(MyCircularQueue* obj, int value) {if (myCircularQueueIsFull(obj)){return false;}obj-a[obj-rear] value;obj-rear;obj-rear % (obj-k 1);return true;
}bool myCircularQueueDeQueue(MyCircularQueue* obj) {if (myCircularQueueIsEmpty(obj)){return false;}obj-front;obj-front % (obj-k 1);return true;
}int myCircularQueueFront(MyCircularQueue* obj) {if (myCircularQueueIsEmpty(obj)){return -1;}else{return obj-a[obj-front];}}int myCircularQueueRear(MyCircularQueue* obj) {if (myCircularQueueIsEmpty(obj)){return -1;}else {return obj-a[(obj-rear obj-k) % (obj-k 1)];}}void myCircularQueueFree(MyCircularQueue* obj) {free(obj-a);free(obj);
} 四 有效的括号
20. 有效的括号 - 力扣LeetCode typedef char STDataType;
typedef struct Stack
{STDataType* a;int top;int capacity;
}ST;void STInit(ST* ps)
{assert(ps);ps-a NULL;ps-top ps-capacity 0;
}void STDestroy(ST* ps)
{assert(ps);free(ps-a);ps-a NULL;ps-top ps-capacity 0;
}void STPush(ST* ps, STDataType x)
{assert(ps);if (ps-top ps-capacity){int newcapacity (ps-capacity 0 ? 4 : ps-capacity * 2);STDataType* tmp (STDataType*)realloc(ps-a, sizeof(STDataType) * newcapacity);if (tmp NULL){perror(realloc fail);exit(-1);}ps-a tmp;ps-capacity newcapacity;}ps-a[ps-top] x;ps-top;
}void STPop(ST* ps)
{assert(ps);assert(ps-top 0);ps-top--;
}STDataType STTop(ST* ps)
{assert(ps);assert(ps-top 0);return ps-a[ps-top - 1];
}int STSize(ST* ps)
{assert(ps);return ps-top;
}bool STEmpty(ST* ps)
{assert(ps);return ps-top 0;
}bool isValid(char* s) {ST st;STInit(st);while (*s){if (*s ( || *s { || *s [){STPush(st, *s);}else{if (STEmpty(st)){STDestroy(st);return false;}char topval STTop(st);STPop(st);if ((*s ] topval ! [) || (*s ) topval ! () || (*s } topval ! {)){STDestroy(st);return false;}}s;}bool ret STEmpty(st);STDestroy(st);return ret;
}
