2024/4/2—力扣—栈的最小值

代码实现:

cpp 复制代码
typedef struct node {
    int val;
    struct node *next;
} Node;

typedef struct {
    struct node *top;
    int min;
} MinStack;

/** initialize your data structure here. */

MinStack* minStackCreate() {
    MinStack *obj = malloc(sizeof(*obj));
    obj->top = NULL;
    obj->min = INT_MAX;
    return obj;
}

void minStackPush(MinStack *obj, int x) {
    Node *p = malloc(sizeof(*p));
    p->val = x;
    p->next = NULL;
    obj->min = obj->min > x ? x : obj->min;
    if (obj->top == NULL) {
        obj->top = p;
    } else {
        p->next = obj->top;
        obj->top = p;
    }
}

void minStackPop(MinStack *obj) {
    Node *pc = obj->top;
    obj->top = obj->top->next;
    if (obj->top == NULL) {
        obj->min = INT_MAX;
    } else if (pc->val == obj->min) {
        Node *p = obj->top;
        int fmin = p->val;
        while (p) {
            if (fmin > p->val) {
                fmin = p->val;
            }
            p = p->next;
        }
        obj->min = fmin; 
    }
    pc->next = NULL;
    free(pc);
}

int minStackTop(MinStack *obj) {
    return obj->top->val;
}

int minStackGetMin(MinStack *obj) {
    return obj->min;
}

void minStackFree(MinStack *obj) {
    Node *pc = obj->top;
    while (pc) {
        obj->top = obj->top->next;
        pc->next = NULL;
        free(pc);
        pc = obj->top;
    }
    free(obj);
}

/**
 * Your MinStack struct will be instantiated and called as such:
 * MinStack* obj = minStackCreate();
 * minStackPush(obj, x);
 
 * minStackPop(obj);
 
 * int param_3 = minStackTop(obj);
 
 * int param_4 = minStackGetMin(obj);
 
 * minStackFree(obj);
*/
相关推荐
许愿与你永世安宁3 小时前
力扣343 整数拆分
数据结构·算法·leetcode
爱coding的橙子3 小时前
每日算法刷题Day42 7.5:leetcode前缀和3道题,用时2h
算法·leetcode·职场和发展
YuTaoShao4 小时前
【LeetCode 热题 100】73. 矩阵置零——(解法二)空间复杂度 O(1)
java·算法·leetcode·矩阵
杰克尼5 小时前
1. 两数之和 (leetcode)
数据结构·算法·leetcode
YuTaoShao6 小时前
【LeetCode 热题 100】56. 合并区间——排序+遍历
java·算法·leetcode·职场和发展
JoJo_Way11 小时前
LeetCode三数之和-js题解
javascript·算法·leetcode
凌肖战13 小时前
力扣网C语言编程题:在数组中查找目标值位置之二分查找法
c语言·算法·leetcode
GEEK零零七15 小时前
Leetcode 1103. 分糖果 II
数学·算法·leetcode·等差数列
重庆小透明16 小时前
力扣刷题记录【1】146.LRU缓存
java·后端·学习·算法·leetcode·缓存
desssq17 小时前
力扣:70. 爬楼梯
算法·leetcode·职场和发展