Submission

Score: 100

User: nicekrittaphat

Problemset: เลขหลักของผลคูณ

Language: cpp

Time: 0.003 second

Submitted On: 2026-10-11 14:25:08

#include <iostream>
#include <cmath>
using namespace std;

int zero=0;

int countzero(int res){
    zero =0;
    while(res>0){
        res /= 10;
        zero+=1;
    }
    return zero;
}

int main(){
    int a;
    int b;
    int k;

    cin>>a>>b>>k;
    if(a>100000||b>100000||k>100000){
        cout<<"error";
    }

    int count1 = countzero(a*b);
    if(k>count1){
        cout<<"_";
    }
    else{
        cout<< (a*b)/(int)(pow(10,count1-k))%10;
    }

    

    


    return 0;
}