使用 C++ 查找二进制矩阵中的重复行
假设我们有一个二进制矩阵。接下来我们将介绍如何在这类矩阵中查找重复行。假设该矩阵如下所示 −
| 1 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 1 | 0 | 0 |
| 1 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 0 | 0 | 1 |
| 0 | 0 | 1 | 0 | 0 | 1 |
在第 3、4、5 个位置有重复行。
为了解决这个问题,我们将使用 Trie 树。Trie 树是一种高效数据结构,用于高效存取字符集较小的数据。搜索复杂度随着键值长度而优化。因此,我们首先将插入的二进制 trie。如果新添加的行已存在,则该行为重复行。
示例
#include<iostream>
using namespace std;
const int MAX = 100;
class Trie {
public:
bool leaf_node;
Trie* children[2];
};
Trie* getNode() {
Trie* node = new Trie;
node->children[0] = node->children[1] = NULL;
node->leaf_node = false;
return node;
}
bool insert(Trie*& head, bool* arr, int N) {
Trie* curr = head;
for (int i = 0; i < N; i++) {
if (curr->children[arr[i]] == NULL)
curr->children[arr[i]] = getNode();
curr = curr->children[arr[i]];
}
if (curr->leaf_node)
return false;
return (curr->leaf_node = true);
}
void displayDuplicateRows(bool matrix[][MAX], int M, int N) {
Trie* head = getNode();
for (int i = 0; i < M; i++)
if (!insert(head, matrix[i], N))
cout << "There is a duplicate row at position: "<< i << endl;
}
int main() {
bool mat[][MAX] = {
{1, 1, 0, 1, 0, 1},
{0, 0, 1, 0, 0, 1},
{1, 0, 1, 1, 0, 0},
{1, 1, 0, 1, 0, 1},
{0, 0, 1, 0, 0, 1},
{0, 0, 1, 0, 0, 1},
};
displayDuplicateRows(mat, 6, 6);
}
输出
There is a duplicate row at position: 3 There is a duplicate row at position: 4 There is a duplicate row at position: 5
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