Submission #19805

#	Time	Username	Problem	Language	Result	Execution time	Memory
19805		chan492811	창문 (kriii4_C)	C++98	3 / 100	0 ms	1084 KiB

C

#include <cstdio>
#include <algorithm>
#define mod 1000000007
#define ll long long
using namespace std;

ll h,w,cnt,a,b,s,now;
ll table[100];

void make_table(ll a){
    int i;
    table[0]=a%mod;
    for(i=1;i<32;i++) table[i]=(table[i-1]*table[i-1])%mod;
}
ll pow(ll a,ll s){
    ll i,now=1,res=1;
    make_table(a);
    for(i=0;s;i++){
        if(s&now) res*=table[i],res%=mod,s-=now; now*=2;
    }
    return res;
}
int main(){
    scanf("%lld %lld",&h,&w); h%=mod; w%=mod; cnt=(h*(h+1)/2)%mod; cnt*=(w*(w+1)/2)%mod; cnt%=mod; if(cnt==0) cnt=mod;
    a=(((w*(w+1))%mod)*(w+2))%mod; a*=((((h*(h+1))%mod)*(h+2))%mod); a%=mod; cnt*=36; cnt%=mod; a*=9; a%=mod;
    now=__gcd(a,cnt); a/=now; cnt/=now;
    b=pow(cnt,mod-2);
    printf("%lld",(a*b)%mod);
    return 0;
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 97