C++ 程序在 STL 中实现 Next_Permutation
STL 中的 Next_permutation 可用来重新按顺序将 [first, last] 范围内的元素排列成更大的下一个词法排列。排列是 N! 可能的元素排列中的每一个排列。本 C++ 程序在 STL 中实现了 Next_permutation。
算法
Begin Define one integer array variable elements[]. Get the number of data e from the user. Initialize the array elements[] with e number of data from the keyboard. Sort all the array elements. do show(elements, e) //to display the current content of the array while (next_permutation(elements, elements + e)) End
示例代码
#include<iostream>
#include <algorithm>
using namespace std;
void show(int a[], int n) {
for(int i = 0; i < n; i++) {
cout<<a[i]<<" ";
}
cout<<endl;
}
int main () {
int e, i;
cout<<"Enter number of elements to be inserted: ";
cin>>e;
int elements[e];
for (i = 0; i < e; i++) {
cout<<"Enter "<<i + 1<<" element: ";
cin>>elements[i];
}
sort (elements, elements + e);
cout << "The "<<e<<"! possible permutations with ";
cout<<e<<" elements: "<<endl;
do {
show(elements, e);
}
while (next_permutation(elements, elements + e));
return 0;
}输出
Enter number of elements to be inserted: 4 Enter 1 element: 7 Enter 2 element: 6 Enter 3 element: 2 Enter 4 element: 10 The 4! possible permutations with 4 elements: 2 6 7 10 2 6 10 7 2 7 6 10 2 7 10 6 2 10 6 7 2 10 7 6 6 2 7 10 6 2 10 7 6 7 2 10 6 7 10 2 6 10 2 7 6 10 7 2 7 2 6 10 7 2 10 6 7 6 2 10 7 6 10 2 7 10 2 6 7 10 6 2 10 2 6 7 10 2 7 6 10 6 2 7 10 6 7 2 10 7 2 6 10 7 6 2
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