#include <cstdio>
#include <iostream>
using namespace std;
#define MAX_SIZE 1002
int arr[MAX_SIZE];
int tmp_arr[MAX_SIZE];
bool zu_entfernen[MAX_SIZE]; // to_remove, to_usuniecia
int n, k, p;
int sum = 0;
//Prints the array
void printArr(int a[], int n)
{
for (int i = 0; i < n; i++)
printf("%d ", a[i]);
printf("\n");
}
//void checkArray(int arr[], int n) {
void checkArray(int n) { // Optimizzation (stack size 1 param less)
for (int i = 0; i < n; i++)
{
tmp_arr[i] = arr[i];
zu_entfernen[i] = false;
}
for (int kk = 0; kk < k; kk++)
{
for (int i = 0; i < n - 1; i++)
{
if (tmp_arr[i] < tmp_arr[i + 1])
{
zu_entfernen[i] = true;
}
else
{
zu_entfernen[i + 1] = true;
}
}
int counter = 0;
for (int i = 0; i < n; i++)
{
if (zu_entfernen[i] == false)
{
tmp_arr[counter] = tmp_arr[i];
counter++;
}
else {
zu_entfernen[i] = false;
}
}
n = counter;
if (n == 1 && kk != k - 1)
{
return;
}
}
if (n == 1)
{
sum++;
}
//printArr(tmp_arr, n);
}
// Generating permutation using Heap Algorithm
//void heapPermutation(int arr[], int size, int n)
void heapPermutation(int size, int n) // Opitimization
{
// if size becomes 1 then prints the obtained
// permutation
if (size == 1)
{
checkArray(n);
return;
}
for (int i = 0; i < size; i++)
{
heapPermutation(size - 1, n);
// if size is odd, swap first and last
// element
if (size % 2 == 1)
swap(arr[0], arr[size - 1]);
// If size is even, swap ith and last
// element
else
swap(arr[i], arr[size - 1]);
}
}
// Driver code
int main()
{
scanf("%d %d %d", &n, &k, &p);
for (int i = 0; i < n; i++)
{
arr[i] = i + 1;
}
//int a[] = { 1, 2, 3 };
//int n = sizeof a / sizeof a[0];
heapPermutation(n, n);
printf("%d", sum%p);
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | #include <cstdio> #include <iostream> using namespace std; #define MAX_SIZE 1002 int arr[MAX_SIZE]; int tmp_arr[MAX_SIZE]; bool zu_entfernen[MAX_SIZE]; // to_remove, to_usuniecia int n, k, p; int sum = 0; //Prints the array void printArr(int a[], int n) { for (int i = 0; i < n; i++) printf("%d ", a[i]); printf("\n"); } //void checkArray(int arr[], int n) { void checkArray(int n) { // Optimizzation (stack size 1 param less) for (int i = 0; i < n; i++) { tmp_arr[i] = arr[i]; zu_entfernen[i] = false; } for (int kk = 0; kk < k; kk++) { for (int i = 0; i < n - 1; i++) { if (tmp_arr[i] < tmp_arr[i + 1]) { zu_entfernen[i] = true; } else { zu_entfernen[i + 1] = true; } } int counter = 0; for (int i = 0; i < n; i++) { if (zu_entfernen[i] == false) { tmp_arr[counter] = tmp_arr[i]; counter++; } else { zu_entfernen[i] = false; } } n = counter; if (n == 1 && kk != k - 1) { return; } } if (n == 1) { sum++; } //printArr(tmp_arr, n); } // Generating permutation using Heap Algorithm //void heapPermutation(int arr[], int size, int n) void heapPermutation(int size, int n) // Opitimization { // if size becomes 1 then prints the obtained // permutation if (size == 1) { checkArray(n); return; } for (int i = 0; i < size; i++) { heapPermutation(size - 1, n); // if size is odd, swap first and last // element if (size % 2 == 1) swap(arr[0], arr[size - 1]); // If size is even, swap ith and last // element else swap(arr[i], arr[size - 1]); } } // Driver code int main() { scanf("%d %d %d", &n, &k, &p); for (int i = 0; i < n; i++) { arr[i] = i + 1; } //int a[] = { 1, 2, 3 }; //int n = sizeof a / sizeof a[0]; heapPermutation(n, n); printf("%d", sum%p); return 0; } |
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