Submission

Score: 30

User: PEPSEALSEA

Problemset: เลขหลักของผลคูณ

Language: cpp

Time: 1.090 second

Submitted On: 2026-09-26 19:56:41

#include <bits/stdc++.h>
using namespace std;

int powerTen(int n){
    if(n==0) return 1;
    int sum = 1;
    for(int i = 1 ; i<n ; i++){
        sum *= 10;
    }

    return sum;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int a,b,x;
    cin >> a >> b >> x;

    int sum = a*b;
    int numDigit = floor(log10(sum))+1;
    if(x > numDigit) cout << "_";
    int div = sum / powerTen(numDigit-x-1);
    cout << div%10;
    return 0;
}