Submission

Score: 90

User: tull

Problemset: เลขหลักของผลคูณ

Language: cpp

Time: 0.002 second

Submitted On: 2026-06-05 21:06:02

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define bp '\n'
#define ld long double
#define vp cout<<'\n';
#define all(A) A.begin(),A.end()
using pii=pair<int,int>;
const int MOD=1e9+7;
const int MNLL=-1e18;
const int MXLL=1e18;
const int N=2e5+10;
const string sans[]={"no","yes"};
signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    int a,b;
    cin>>a>>b;
    a*=b;
    cin>>b;
    vector<int>f;
    while(a)
    {
        f.emplace_back(a%10);
        a/=10;
    }
    if(b>=f.size())cout<<"_";
    else cout<<f[f.size()-b];
    //for(auto&e:f)cout<<e<<' ';
    
}
/*


*/