Submission #19968

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
19968	2016-02-25 07:56:39	Namnamseo	팔찌 (kriii4_V)	C++14	6 / 100	1000 ms	24644 KiB

V

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#include<cstdio>
#include<bitset>
typedef long long ll;
ll M=int(1e9)+7;
ll pow(ll x,ll y){
    if(y==0)return 1;
    if(y==1)return x;
    ll o=pow(x,y/2);
    if(y%2==0)return o*o%M;
    else return o*o%M*x%M;
}
ll ans [1000010];
ll phi [1000010];
ll kpow[1000010];
std::bitset<1000010> sieve;
int n,k;
int main(){
    scanf("%d%d",&n,&k);
    int i,j;
    kpow[0]=1; kpow[1]=k; phi[1]=1;
    for(i=2; i<=n; ++i){
        kpow[i]=kpow[i-1]*k%M;
        if(sieve[i]) continue;
        // i is prime.
        for(j=i; j<=n; j+=i){
            sieve[j]=true;
            if(phi[j]==0) phi[j]=j;
            phi[j] /= i;
            phi[j] *= i-1;
        }
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 0 / 94