C++ 中的雙對稱矩陣?
以下列出一個程式,它將檢查一個矩陣是否為雙對稱的對稱矩陣。雙對稱矩陣是一個方矩陣,關於這兩個主對角線對稱。以下矩陣是一個雙對稱矩陣的示例。
1 2 3 4 5 2 6 7 8 4 3 7 9 7 3 4 8 7 6 2 5 4 3 2 1
演算法
checkBiSymmetric(mat, n)
Begin for i in range 0 to n – 1, do for j in range 0 to i – 1, do if mat[i, j] is not same as mat[j, i], then return false end if done done for i in range 0 to n – 1, do for j in range 0 to n – i, do if mat[i, j] is not same as mat[n – j - 1, n – i - 1], then return false end if done done return true End
示例
#include<iostream>
#define N 5
using namespace std;
int matrix[N][N] = {{1, 2, 3, 4, 5},
{2, 6, 7, 8, 4},
{3, 7, 9, 7, 3},
{4, 8, 7, 6, 2},
{5, 4, 3, 2, 1}};
bool checkBiSymmetric() {
for (int i = 0; i < N; i++) //scan through forward diagonal
for (int j = 0; j < i; j++)
if (matrix[i][j] != matrix[j][i]) //when corresponding elements are not same, return false
return false;
for (int i = 0; i < N; i++) //scan through forward diagonal
for (int j = 0; j < N - i; j++)
if (matrix[i][j] != matrix[N - j - 1][N - i - 1]) //when corresponding elements are not same, return false
return false;
return true; //otherwise return true
}
main() {
if(checkBiSymmetric()){
cout << "Yes the matrix is bisymmetric";
} else {
cout << "No the matrix is not bisymmetric";
}
}輸出
Yes the matrix is bisymmetric
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