时间：2021-07-01 10:21:17 帮助过：2人阅读
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
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).
Sample test(s)
input
2 15
output
69 96
input
3 0
output
-1 -1
题意：给两个数m, s，求出位数等于m 且个位数字之和等于s的最小数和最大数。
解题思路：直接贪心的去构造。先判断输出-1，-1的情况：m*9 < s || m = 0; 但是这里有点小坑，题中讲了，当m == 1 && s == 0时，要特别考虑一下，此时max = min = 0；最大的情况肯定是前面的位数尽可能的大，剩下的位不够的直接为0；最小值，把第一位置为1，剩下的从最后一位尽可能的分配，前面要是不够，就只为0.
AC代码：
#include#include #include #include #include #include #include #include