C. Given Length and Sum of Digits... （贪心）

Posted 2020-12-17 riotian

https://codeforces.com/problemset/problem/489/C

C. Given Length and Sum of Digits...

You have a positive integer m and a non-negative integer s. Your task is to find the smallest and the largest of the numbers that have length m and sum of digits s. The required numbers should be non-negative integers written in the decimal base without leading zeroes.

Input

The single line of the input contains a pair of integers m, s (1?≤?m?≤?100,?0?≤?s?≤?900) — the length and the sum of the digits of the required numbers.

Output

In the output print the pair of the required non-negative integer numbers — first the minimum possible number, then — the maximum possible number. If no numbers satisfying conditions required exist, print the pair of numbers "-1 -1" (without the quotes).

Examples

input

2 15

output

69 96

input

3 0

output

-1 -1

题意：

给定一个数m 和 一个长度s，计算最大和最小在s长度下的十进制各位数和为m的值

注意如果无法生成，即输出两个-1

题解：

有个小坑，在输出最大值时得注意下k 是否为 0

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m, s, i, k;
    cin >> m >> s;
    if (s < 1 && m>1 || s > m * 9)
        cout << -1 << " " << -1 << endl;
    else {
        for (i = m - 1, k = s; i >= 0; i--) {
            int j = max(0, k - 9 * i);
            if (j == 0 && i == m - 1 && k) j = 1;
            cout << j;
            k -= j;
        }
        cout << ‘ ‘;
        for (i = m - 1, k = s; i >= 0; i--) {
            int j = min(9, k);
            cout << j;
            k -= j;
        }
    }
}