Submission

Score: 100

User: jeeno987

Problemset: เลขหลักของผลคูณ

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-10 18:17:26

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

// Reads A, B, x as the first three numbers in the input (also works if a line is written like "A = 25").
int main() {
    long long v[3] = {0, 0, 0};
    int k = 0;
    char c;
    bool in = false;
    while (k < 3 && cin.get(c)) {
        if (c >= '0' && c <= '9') { v[k] = v[k] * 10 + (c - '0'); in = true; }
        else if (in) { k++; in = false; }
    }
    long long p = v[0] * v[1];
    string s = "";
    if (p == 0) s = "0";
    while (p > 0) { s = char('0' + p % 10) + s; p /= 10; }
    long long x = v[2];
    if (x >= 1 && x <= (long long)s.size()) cout << s[x - 1] << '\n';
    else cout << "_" << '\n';
    return 0;
}