纯粹的找规律题。
1: 2
2: 5
3: 5
4: 4
5: 5
6: 6
7: 3
8: 7
9: 6
0: 6
2 1 1
3 7 7
4 4 11
5 2 71
6 6 111
7 8 711
8 10 1111
9 18 7111
10 22 11111
11 20 71111
12 28 111111
13 68 711111
14 88
15 108
16 188
17 200
18 208
19 288
20 688
21 888
22 1088
1 /* 2772 */ 2 #include <cstdio> 3 #include <cstring> 4 #include <cstdlib> 5 6 int a[15] = {0, 0, 1, 7, 4, 2, 6, 8, 10, 18, 22, 20, 28, 68, 88}; 7 int b[7] = {888, 108, 188, 200, 208, 288, 688}; 8 9 int main() { 10 int t, n; 11 int i, j, k; 12 13 #ifndef ONLINE_JUDGE 14 freopen("data.in", "r", stdin); 15 freopen("data.out", "w", stdout); 16 #endif 17 18 scanf("%d", &t); 19 while (t--) { 20 scanf("%d", &n); 21 // print min 22 if (n < 15) { 23 printf("%d", a[n]); 24 } else { 25 i = n % 7; 26 printf("%d", b[i]); 27 j = (n-15)/7; 28 while (j--) 29 printf("8"); 30 } 31 // print max 32 i = n & 1; 33 if (i == 0) 34 printf(" 1"); 35 else 36 printf(" 7"); 37 j = (n-2)/2; 38 while (j--) 39 printf("1"); 40 printf("\n"); 41 } 42 43 return 0; 44 }
原文：http://www.cnblogs.com/bombe1013/p/4183715.html