The combination of N output and N count in a full arrangement (number range: ~ B)

N output in full arrangement:

int WPermutation(int num, bool bRepeat)

Num indicates that num is in full order.

Whether the brepeat flag generates a sequence of repeated elements.

int Permutation(int n, int* A, int cur, bool bRepeat) {static int number = 0;if(cur == n){   number++;for(int i = 0; i< n; i++){printf("%d ", A[i]);}printf("\n");}else{for(int i = 1; i <= n; i++){int ok = 1;for(int j = 0; j < cur; j++)    {if(!bRepeat){if(A[j] == i){ok = 0;}}}if(ok){A[cur] = i;Permutation(n, A, cur + 1, bRepeat);}}}    return number;}int WPermutation(int num, bool bRepeat){printf("%d permutation(%s): %d ~ %d\n", num, bRepeat?"repeat mode":"single mode", 1, num);int n = num;int *A = (int*)malloc(n*sizeof(int));memset(A, 0, sizeof(n*sizeof(int)));int cur = 0;int number = Permutation(n, A, cur, bRepeat);delete [] A ;A = NULL;printf("over!\n");return number;}

Combination of N numbers (number range: St ~ ), Consider repeating elements:

int Wpermutation(int st, int en, int n, bool bRepeat)；

N indicates a combination of N numbers.

The value range is St ~ En

Whether the brepeat flag generates a sequence of repeated elements.

int Permutation(int st, int en, int n, int* A, int cur, bool bRepeat){static int number = 0;if(cur == n){   number++;for(int i = 0; i< n; i++){printf("%d ", A[i]);}printf("\n");}else{for(int i = st; i <= en; i++){int ok = 1;for(int j = 0; j < cur; j++){if(!bRepeat){if(A[j] == i){ok = 0;}}}if(ok){A[cur] = i;Permutation(st, en, n, A, cur + 1, bRepeat);}}}return number;}int Wpermutation(int st, int en, int n, bool bRepeat){printf("%d permutation(%s): %d ~ %d\n", n, bRepeat?"repeat mode":"single mode", st, en);int num = en - st + 1;if(n > num){bRepeat = true;printf("too many number, to be repeat mode:\n");}int *A = (int*)malloc(n*sizeof(int));memset(A, 0, sizeof(n*sizeof(int)));int cur = 0;int number = Permutation(st, en, n, A, cur, bRepeat);delete [] A ;A = NULL;printf("over!\n");return number;}

The combination of N output and N count in a full arrangement (number range: ~ B)