int temp = 0; for(int i=0;i<len;i++){ for(int j=0;j<len-i;j++){ if(list[j]>list[j+1]){ temp = list[j]; list[j] = list[j+1]; list[j+1] = temp; } } }
时间: 2024-04-22 12:22:53 浏览: 16
这段代码是一个冒泡排序的实现,用于将一个数组中的元素按照从小到大的顺序进行排序。其中,变量"len"表示数组的长度,"list"则是需要排序的数组。在排序过程中,程序通过比较相邻两个元素的大小,如果前一个元素大于后一个元素,则交换这两个元素的位置。
具体来说,外层循环控制比较的轮数,内层循环则控制每轮比较的次数。在每轮比较中,程序将当前位置的元素与下一个位置的元素进行比较,如果当前元素大于下一个元素,则交换这两个元素的位置。经过多轮比较和交换,最终实现了数组的排序。
需要注意的是,这段代码并没有对数组中的重复元素进行去重操作。如果需要去重,可以在排序完成后再进行遍历去重。
相关问题
void mergeSort(int* nums, int begin, int end) { if (begin >= end) { return; } int len = end - begin+1; int mid = begin + (end - begin) / 2; mergeSort(nums, begin, mid); mergeSort(nums, mid+1, end); int* temp = new int[len]; temp = { 0 }; int l1 = begin, r1 = mid; int l2 = mid+1, r2 = end; int i = begin; for (; l1 <= r1 && l2 <= r2;) { if (nums[l1] < nums[l2]) { temp[i++] = nums[l1++]; } else { temp[i++] = nums[l2++]; } } for (; l1 <= r1;) { temp[i++] = nums[l1++]; } for (; l2 <= r2;) { temp[i++] = nums[l2++]; } for (int j = 0; j < len; j++) { nums[j+begin] = temp[j]; } } 出现读取访问冲突,修改代码
在代码中,`temp`被赋值为一个新的`int`数组,然后又被赋值为`{0}`,这样会导致`temp`指向了一个新的内存地址,原有的内存地址被泄漏。在后续的代码中,程序又对这个新的内存地址进行了读写操作,从而导致了读取访问冲突。为了解决这个问题,应该在申请`int`数组的同时,将数组中的元素全部初始化为0。修改后的代码如下:
```
void mergeSort(int* nums, int begin, int end) {
if (begin >= end) {
return;
}
int len = end - begin+1;
int mid = begin + (end - begin) / 2;
mergeSort(nums, begin, mid);
mergeSort(nums, mid+1, end);
int* temp = new int[len](); // 将数组中的元素全部初始化为0
int l1 = begin, r1 = mid;
int l2 = mid+1, r2 = end;
int i = begin;
for (; l1 <= r1 && l2 <= r2;) {
if (nums[l1] < nums[l2]) {
temp[i++] = nums[l1++];
}
else {
temp[i++] = nums[l2++];
}
}
for (; l1 <= r1;) { temp[i++] = nums[l1++]; }
for (; l2 <= r2;) { temp[i++] = nums[l2++]; }
for (int j = 0; j < len; j++) {
nums[j+begin] = temp[j];
}
delete[] temp; // 释放动态申请的内存空间
}
```
用python语言翻译如下代码://线性移位寄存器生成密钥 int IFSR(int K) { int feature = 143; int temp1, temp2; temp1 = feature & K; while (temp1) { temp2 = (temp2 + temp1 & 1) % 2; temp1 = temp1 >> 1; } K = ((K << 1) & 255) + temp2; return K; } //生成16轮密钥 void getKeys(int round) { for (int i = 0; i < round; i++) { int temp = 0; for (int j = 0; j < 8; j++) { K = IFSR(K); temp += K & 1; temp = temp << 1; } temp = temp >> 1; Keys[i] = temp; } } //轮函数 int F(int RE, int Ki) { Ki = Ki >> 4; int temp = Ki ^ RE; return temp; } //明文加密 void encrypy(int round) { int m, temp1, temp_j; int le, re; m = strlen(str_plaincode); for (int i = 0; i < m; i++) { int temp1; if (i == 0) temp1 = IV; else temp1 = ((IV << j) ^ temp_j) & 255; le = temp1 >> 4; re = temp1 & 15; for (int j = 0; j < round; j++) { int temp2 = le; le = re; re = (temp2 ^ F(re, Keys[j])); } temp_j = (re << 4) + le; temp_j = temp_j >> (8 - j); str_ciphertext[i] = str_plaincode[i] ^ temp_j; } } //解密
以下是Python代码的翻译:
```python
# 线性移位寄存器生成密钥
def IFSR(K):
feature = 143
temp1, temp2 = 0, 0
temp1 = feature & K
while temp1:
temp2 = (temp2 + temp1 & 1) % 2
temp1 >>= 1
K = ((K << 1) & 255) + temp2
return K
# 生成16轮密钥
def getKeys(round):
global Keys
Keys = [0] * round
for i in range(round):
temp = 0
for j in range(8):
global K
K = IFSR(K)
temp += K & 1
temp <<= 1
temp >>= 1
Keys[i] = temp
# 轮函数
def F(RE, Ki):
Ki = Ki >> 4
temp = Ki ^ RE
return temp
# 明文加密
def encrypy(round):
global str_ciphertext
m = len(str_plaincode)
for i in range(m):
temp1 = 0
if i == 0:
temp1 = IV
else:
temp1 = ((IV << j) ^ temp_j) & 255
le = temp1 >> 4
re = temp1 & 15
for j in range(round):
temp2 = le
le = re
re = (temp2 ^ F(re, Keys[j]))
temp_j = (re << 4) + le
temp_j = temp_j >> (8 - j)
str_ciphertext.append(str_plaincode[i] ^ temp_j)
# 解密
def decode():
global test
m = len(str_ciphertext)
for i in range(m):
temp1 = 0
if i == 0:
temp1 = IV
else:
temp1 = ((IV << j) ^ temp_j) & 255
le = temp1 >> 4
re = temp1 & 15
for j in range(round):
temp2 = le
le = re
re = (temp2 ^ F(re, Keys[round-j-1]))
temp_j = (re << 4) + le
temp_j = temp_j >> (8 - j)
test += chr(str_ciphertext[i] ^ temp_j)
```