Submission #19688

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
19688	2016-02-25 04:34:21	Namnamseo	괄호 (kriii4_R)	C++14	100 / 100	419 ms	32332 KiB

R

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#include <cstdio>
typedef long long ll;
const ll M=int(1e9)+7;
ll catalan[1000010];
ll fact[2000010];
ll kpow[1000010];
ll pow(ll a,ll b){
    if(b==0) return 1;
    ll ret=pow(a,b/2);
    ret=(ret*ret)%M;
    if(b&1) ret=(ret*a)%M;
    return ret;
}
int main()
{
    int n,k;
    int i;
    scanf("%d%d",&n,&k);
    
    fact[0]=1;
    kpow[0]=1;
    for(i=1; i<=2*n; ++i) fact[i]=(fact[i-1]*i)%M;
    catalan[0]=1;
    for(i=1; i<=n; ++i){
        catalan[i] = fact[2*i] * pow( fact[i+1]*fact[i]%M, M-2 ) %M;
        kpow[i] = (kpow[i-1]*k)%M;
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 92 / 92