Question

Answer 1

Bạn muốn chia sẻ đề thi hửm?

Answer 2

Bài 2: 

2:

#include <bits/stdc++.h>

using namespace std;

string n;

int t,d,i;

int main()

{

freopen("tinhtong.inp","r",stdin);

freopen("tinhtong.out","w",stdout);

cin>>n;

cin>>m;

d=n.length();

t=0;

for (i=d-m-1; i<=d-1; i++)

t=t+int(n[i])-48;

cout<<t;

return 0;

}