Submission #20035

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
20035	2016-02-25 08:46:45	ainta	로봇 (kriii4_F)	C++98	4 / 100	617 ms	1084 KiB

F

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#include<stdio.h>
long long L,M,R, Res, Mod = 1000000007;
int n, dx[4]={1,0,-1,0},dy[4]={0,-1,0,1};
long long Pow(long long a, long long b){
    long long r = 1;
    while(b){
        if(b%2)r=r*a%Mod;
        a=a*a%Mod;b/=2;
    }
    return r;
}
void Do(int pv, int x, int y, int dir, long long g){
    if(pv==n){
        Res = (Res+(x*x+y*y)*g)%Mod;
        return;
    }
    Do(pv+1,x+dx[dir],y+dy[dir],dir,g*M%Mod);
    Do(pv+1,x+dx[(dir+3)%4],y+dy[(dir+3)%4],(dir+3)%4,g*L%Mod);
    Do(pv+1,x+dx[(dir+1)%4],y+dy[(dir+1)%4],(dir+1)%4,g*R%Mod);
}
int main(){
    scanf("%d%lld%lld%lld",&n,&L,&M,&R);
    if(n>15)return 0;
    Do(0,0,0,0,1);
    printf("%lld\n",Res*Pow(Pow((L+M+R)%Mod,Mod-2),n)%Mod);
}
 
 
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• Subtask 1: 4 / 4
• Subtask 2: 0 / 96