Visual C++ Console Application - Permutation using STL next_permutation algorithm
Permutation often considered difficult to implement. However if you use STL algorithm, it would be just 4 lines of code.
Source Code
// permutation.cpp : Defines the entry point for the console application.
//
#include <stdio.h>
#include <tchar.h>
#include <algorithm>
#include <string>
#include <iostream>
/***
1 = 1
2 = 2
3 = 6
4 = 24
5 = 120
6 = 720
7 = 5040
***/
int _tmain(int argc, _TCHAR* argv[])
{
std::string str = "1234";
int count = 0;
do
{
std::cout << str.c_str() << "\n";
count++;
} while (std::next_permutation(str.begin(), str.end()) == true);
std::cout << "\n\nCount: " << count << "\n";
return 0;
}
Output
ABC
ACB
BAC
BCA
CAB
CBA
Count: 6
Press any key to continue . . .
1234
1243
1324
1342
1423
1432
2134
2143
2314
2341
2413
2431
3124
3142
3214
3241
3412
3421
4123
4132
4213
4231
4312
4321
Count: 24
Press any key to continue . . .
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