Submission #16931

#	Time	Username	Problem	Language	Result	Execution time	Memory
16931		taehoon1018	팩토리얼 세제곱들의 합 (YDX14_fact)	C++98	1 / 1	0 ms	1084 KiB

fact

#include <stdio.h>
 
int power(int a,int b)
{
    int res=1;
    for (int i=0;i<b;i++) res*=a;
    return res;
}
 
int main(void)
{
    int pool[5]={1,1,2,6,24};
 
    int num,pw,res=0;
    scanf("%d %d",&num,&pw);
 
    if (pw==0) {
        res=num+1;
        goto fin;
    }
    for (int i=0;i<=4;i++) if (i<=num) res+=power(pool[i],pw);
 
    fin:
    for (;;) {
        if (res%10==0) res=res/10;
        else break;
    }
    printf("%d",res%10);
 
    return 0;
}

• Subtask 1: 1 / 1