#include <bits/stdc++.h>
using namespace std;
typedef vector<int> VI;
typedef long long LL;
typedef pair<int,int> PI;
typedef pair<LL,LL> PLL;
typedef unsigned long long ULL;
typedef pair<double,double> PD;
#define FOR(x, b, e) for(int x = b; x<= (e); x++)
#define FORD(x, b, e) for(int x = b; x>= (e); x--)
#define REP(x, n) for(int x = 0; x<(n); ++x)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define PB push_back
#define IN insert
#define ST first
#define ND second
#define INF 2000000011
#define MOD 1000000007
#define MAXSIZE 10010
int perm[MAXSIZE];
int odp[MAXSIZE];
int main(){ //prosze tylko o koszulke, nic wiecej mi do szczescia nie potrzeba
ios::sync_with_stdio(0); cin.tie(0);
LL n,k,p;
cin>>n>>k>>p;
if(k==1){
LL par=1;
REP(i,n-1){
par*=2;
par%=p;
}
cout<<par;
return 0;
}
REP(i,n)
perm[i]=i+1;
do{
VI temp;
VI point;
REP(i,n)
temp.PB(perm[i]);
int t=0;
while(SIZE(temp)>1){
VI bufor;
REP(i,SIZE(temp)){
if(temp[i]<temp[max(0,i-1)]||temp[i]<temp[min(i+1,SIZE(temp))])
bufor.PB(i);
}
FORD(i,SIZE(bufor)-1,0)
temp.erase(temp.begin()+bufor[i]);
t++;
}
odp[t]++;
odp[t]%=p; //bez sensu, ale co tam
}while(next_permutation(perm,perm+n));
cout<<odp[k]%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 | #include <bits/stdc++.h> using namespace std; typedef vector<int> VI; typedef long long LL; typedef pair<int,int> PI; typedef pair<LL,LL> PLL; typedef unsigned long long ULL; typedef pair<double,double> PD; #define FOR(x, b, e) for(int x = b; x<= (e); x++) #define FORD(x, b, e) for(int x = b; x>= (e); x--) #define REP(x, n) for(int x = 0; x<(n); ++x) #define ALL(c) (c).begin(), (c).end() #define SIZE(x) ((int)(x).size()) #define PB push_back #define IN insert #define ST first #define ND second #define INF 2000000011 #define MOD 1000000007 #define MAXSIZE 10010 int perm[MAXSIZE]; int odp[MAXSIZE]; int main(){ //prosze tylko o koszulke, nic wiecej mi do szczescia nie potrzeba ios::sync_with_stdio(0); cin.tie(0); LL n,k,p; cin>>n>>k>>p; if(k==1){ LL par=1; REP(i,n-1){ par*=2; par%=p; } cout<<par; return 0; } REP(i,n) perm[i]=i+1; do{ VI temp; VI point; REP(i,n) temp.PB(perm[i]); int t=0; while(SIZE(temp)>1){ VI bufor; REP(i,SIZE(temp)){ if(temp[i]<temp[max(0,i-1)]||temp[i]<temp[min(i+1,SIZE(temp))]) bufor.PB(i); } FORD(i,SIZE(bufor)-1,0) temp.erase(temp.begin()+bufor[i]); t++; } odp[t]++; odp[t]%=p; //bez sensu, ale co tam }while(next_permutation(perm,perm+n)); cout<<odp[k]%p; return 0; } |
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