Submission #19806

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
19806	2016-02-25 05:47:29	myungwoo	동전 (kriii4_E)	C++14	100 / 100	33 ms	17900 KiB

D

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#include<stdio.h>
#include<memory.h>
#define mod 1000000007
#define inv(a) exp(a,mod-2)
typedef long long lld;
lld exp(lld a, lld b){
  if(b==0)return 1;
  lld k=exp(a, b/2);
  k=(k*k)%mod;
  if(b%2)k=(k*a)%mod;
  return k;
}
lld fac[1001001], rfac[1001001];
void init(){
  lld i;
  fac[0]=rfac[0]=1;
  for(i=1; i<=1000000; i++){
    fac[i]=(fac[i-1]*i)%mod;
    rfac[i]=inv(fac[i]);
  }
}
lld comb(lld a, lld b){
  return fac[a]*rfac[b]%mod*rfac[a-b]%mod;
}
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 95 / 95