CF 489 C Given Length and Sum of Digits... 贪心

题目链接：http://codeforces.com/problemset/problem/489/C

题目大意：给定位数和各个位的和，问满足条件数字的最大值，最小值。

解题思路：模拟即可。主要是细节判断。

代码：

 1 const int inf = 0x3f3f3f3f;
 2 const int maxn = 1e2 + 5;
 3 int m, s;
 4 char ans1[maxn], ans2[maxn];
 5 
 6 void solve(){
 7     memset(ans1, 0, sizeof(ans1));
 8     memset(ans2, 0, sizeof(ans1));
 9     
10     if((s == 0 && m > 1) || s > m * 9) {
11         printf("-1 -1\n");
12         return;
13     }
14     int x = s;
15     for(int i = 1; i <= m; i++){
16         int u = (m - i) * 9;
17         if(u < x) {
18             ans1[i] = (x - u + '0');
19             x = u;
20         }
21         else if(u == x){
22             if(i == 1) {
23                 if(x > 0) {
24                     ans1[i] = '1';
25                     x -= 1;
26                 }
27                 else ans1[i] = '0';
28             }
29             else {
30                 ans1[i] = '0';
31             }
32         }
33         else if(u > x) {
34             if(i == 1) {
35                 ans1[i] = '1';
36                 x -= 1;
37             }
38             else ans1[i] = '0';
39         }
40     }
41     x = s;
42     for(int i = 1; i <= m; i++){
43         if(x >= 9) {
44             ans2[i] = '9';
45             x -= 9;
46         }
47         else{
48             ans2[i] = (x + '0');
49             x = 0;
50         }
51     }
52     
53     printf("%s %s\n", ans1 + 1, ans2 + 1);
54 }
55 int main(){
56     scanf("%d %d", &m, &s);
57     solve();
58 }

题目：

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

Examples
input
2 15
output
69 96
input
3 0
output
-1 -1
posted @ 2017-08-16 17:51  EricJeffrey  阅读(232)  评论(0)  编辑  收藏  举报