C语言写入数组数据时缓冲区溢出

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运行环境:VS2019(C语言编写)

程序目的:实现力扣滑动窗口问题  

给定一个数组 nums 和滑动窗口的大小 k,请找出所有滑动窗口里的最大值。

示例:

输入: nums = [1,3,-1,-3,5,3,6,7], 和 k = 3
输出: [3,3,5,5,6,7] 
解释:
	滑动窗口的位置				最大值
-------------------------		-----
[1  3  -1] -3  5  3  6  7		3
 1 [3  -1  -3] 5  3  6  7		3
 1  3 [-1  -3  5] 3  6  7		5
 1  3  -1 [-3  5  3] 6  7		5
 1  3  -1  -3 [5  3  6] 7		6
 1  3  -1  -3  5 [3  6  7]		7

题目来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/hua-dong-chuang-kou-de-zui-da-zhi-lcof

代码问题:缓冲区溢出错误  C6386

#include<stdlib.h> 
#include<stdio.h>
#include<malloc.h>
#include<string.h>
#define MAXSIZE	 100
typedef struct Queue {
	int front;
	int rear;
	int* base;
}Squeue;
Squeue* InitQueue() {
	Squeue* q = (Squeue*)malloc(sizeof(Squeue));
	if (q == NULL) return NULL;
	q->base = (int*)malloc(sizeof(int) * MAXSIZE);
	q->front = q->rear = -1;
	return q;
}
void Enqueue(Squeue* q, int Elem) {
	if (q->rear == MAXSIZE) return;
	(*q).base[++((*q).rear)] = Elem;
	return;
}
int Dequeue(Squeue* q) {
	if ((*q).rear == (*q).front) return -10;
	int val = (*q).base[++((*q).front)];
	return val;
}
int Bigest(Squeue* q) {
	int bigest = -100;
	while ((*q).front != (*q).rear) {
		int p = Dequeue(q);
		if (p > bigest) {
			bigest = p;
		}
	}
	return bigest;
}
int* maxSlidingWindow(int* nums, int numsSize, int k, int* returnSize) {
	if (nums == NULL)  return NULL;
	int* Bnums = (int*)malloc(sizeof(int) * numsSize);
	if (Bnums == NULL) return NULL;
	memset(Bnums, -100, sizeof(int) * numsSize);
	if (numsSize <= k) {
		int i = 0;
		for (int i = 0; i < numsSize; i++) {
			if (nums[i] > Bnums[0]) {
				Bnums[0] = nums[i];
			}
		}
		*returnSize = 1;
		return  Bnums;
	}
	Squeue* q = InitQueue();
	int as = 0;
	for (int i = 0; i < numsSize; i++) {
		int j = i;
		while (j < k) {
			Enqueue(q, nums[j]);
		}
		/**
		这里写入数据会报C6386
		缓冲区溢出的错误
		**/
		Bnums[as] = Bigest(q);
		k++;
		as++;
	}
	free(q->base);
	q->base = NULL;
	free(q);
	q = NULL;
	*returnSize = as;
	return Bnums;
}
int main() {
	int L;
	printf("输入需要创建的数组长度L:\n");
	scanf_s("%d", &L);
	int* nums = (int*)malloc(sizeof(int) * L);
	if (nums == NULL) return -1;
	int flag;
	int i = 0;
	int* Nums = nums;
	printf("输入%d个数字:\n", L);
	for (int i = 0; i < L; i++) {
		scanf_s("%d", &flag);
		*nums++ = flag;
	}
	int res = 0;
	int k;
	printf("输入滑动窗口的大小:\n");
	scanf_s("%d", &k);
	int* result = maxSlidingWindow(Nums, L, k, &res);
	for (int i = 0; i < res; i++) {
		printf("%d\n", result[i]);
	}
	return 0;
}
ava
凤栖梧

2020-10-31

问题已经解决,while (j < k) { Enqueue(q, nums[j]); } .这条语句出现死循环导致程序出错。 - 凤栖梧 2020-11-25
0
...
		while (j < k) {
			Enqueue(q, nums[j]);
		}
...

这个是什么神仙操作,永动机么 ..

ava
xiongfj ◑◑

2020-11-3

确实是这里的问题,我只排查了报错了的地方。。。。 - 凤栖梧 2020-11-5
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