Submission #881977

#	Time	Username	Problem	Language	Result	Execution time	Memory
881977		dosts	Energetic turtle (IZhO11_turtle)	C++17	5 / 100	2094 ms	13788 KiB

turtle

#include <bits/stdc++.h>
using namespace std;
#define sp << " " << 
#define int long long
#define vi vector<int>
#define F(xxx,yyy) for (int xxx=1;xxx<=yyy;xxx++)
#define pii pair<int,int>
const int N = 1e5+1,inf = 1e18,P=6e5+1;
int MOD;
vi pri;
int sieve[P];
int add(int x,int y) {return (x+y >= MOD)?x+y-MOD:x+y;}
int mult(int x,int y) {return ((x%MOD)*(y%MOD))%MOD;}
int expo(int x,int y) {
  if (!y) return 1;
  int e = expo(x,y/2);
  e = mult(e,e);
  if (y&1) e = mult(e,x);
  return e;
}
void prec() {
  memset(sieve,0,sizeof sieve);
  for (int i=2;i<P;i++) {
    if (!sieve[i]){
      sieve[i] = i;
      pri.push_back(i);
      for (int j=i*i;j<P;j+=i) sieve[j] = i; 
    }
  }
}
int nck(int n,int k) {
  if (n<k) return 0;
  if (n<0 || k < 0) return 0;
  int ans = 1;
  for (auto it : pri) {
    if (it > n) break;
    int sm = 0;
    for (int cur = it;cur<=n;cur*=it) sm+=n/cur;
    for (int cur = it;cur<=k;cur*=it) sm-=k/cur;
    for (int cur = it;cur<=n-k;cur*=it) sm-=(n-k)/cur;
    ans = mult(ans,expo(it,sm));
  }
  return ans;
}

void solve() {
  int n,m,k,t;
  cin >> n >> m >> k >> t >> MOD;
  prec();
  n++;
  m++;
  vector<pii> pts(k+1);
  F(i,k) cin >> pts[i].first >> pts[i].second;
  F(i,k) pts[i].first++;
  F(i,k) pts[i].second++;
  sort(pts.begin()+1,pts.end());
  int lim = (1<<k);
  vi dp(lim,0);
  for (int i=0;i<lim;i++) {
    vi ys;
    vector<pii> pt = {{1,1}};
    for (int j=0;j<k;j++) if (i&(1<<j)) pt.push_back(pts[j+1]);
    pt.push_back({n,m});
    int sz = pt.size();
    int p = 1;
    for (int i=0;i<sz-1;i++) {
      int dx = pt[i+1].first-pt[i].first;
      int dy = pt[i+1].second-pt[i].second;
      p = mult(p,nck(dx+dy,dx));
    }
    dp[i] = p;
  }
  int ans = 0;
  for (int i=0;i<lim;i++) {
    int pc = __builtin_popcountll(i);
    if (pc > t && pc%2!=t%2) {
      ans = add(ans,MOD-dp[i]);
    }
    else ans = add(ans,dp[i]);
  }
  cout << ans << endl;
}	
    
                  
                             
signed main() { 
  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  #ifdef Local
  freopen("in","r",stdin);
  freopen("out","w",stdout);
  #endif
  int t = 1;
  //cin >> t;
	F(i,t) solve();
}

• Subtask 1: 5 / 100