#include<bits/stdc++.h>
using namespace std;
long long calc(long long n){
long long cnt = n / 9;
long long res = cnt * 45 + (n % 9) * (n % 9 + 1) / 2;
return res;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int q;
cin >> q;
while(q--){
long long l, r;
cin >> l >> r;
cout << calc(r) - calc(l - 1) << '\n';
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
344 KB |
Output is correct |
2 |
Correct |
1 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
348 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |