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  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. int digit_decomp(int num, int digits[]) {
  6. 	int i;
  7. 	for (i = 0; num; i++) {
  8. 		digits[i] = num % 10;
  9. 		num /= 10;
  10. 	}
  11. 	return i;
  12. }
  13.  
  14. int main() {
  15. 	int N = 0;
  16. 	int K[3] = { 0 };
  17. 	int N_digits = 0;
  18. 	int num_K = 0;
  19. 	int digits[9] = { 0 };
  20.     int ans[9] = { 0 };
  21.  
  22. 	cin >> N >> num_K;
  23.  
  24. 	for (int i = 0; i < num_K; i++) {
  25. 		cin >> K[i];
  26. 	}
  27.  
  28. 	sort(K, K + num_K, greater<int>());
  29.  
  30. 	N_digits = digit_decomp(N, digits);
  31.  
  32. 	bool sw0 = false, sw1 = false;
  33. 	for (int i = N_digits - 1; i >= 0; i--) {
  34. 		for (int j = 0; j < num_K; j++) {
  35. 			if (sw1) {
  36. 				ans[i] = K[j];
  37. 				break;
  38. 			}
  39. 			if (digits[i] == K[j]) {
  40. 				if (i > 0 && digits[i - 1] >= K[num_K - 1]) {
  41. 					ans[i] = K[j];
  42. 					break;
  43. 				}
  44. 			}
  45. 			if (digits[i] > K[j]) {
  46. 				ans[i] = K[j];
  47.                 sw1 = true;
  48. 				break;
  49. 			}
  50. 			if (j == num_K - 1) {
  51. 				sw0 = true;
  52. 			}
  53. 		}
  54. 		if (sw0) {
  55. 			sw0 = false;
  56. 			for (int j = 1; i + j < N_digits; j++) {
  57. 				if (ans[i + j] != 0 && ans[i + j] != K[num_K - 1]) {
  58. 					i = i + j;
  59. 					for (int k = 0; k < num_K - 1; k++) {
  60. 						if (ans[i] == K[k]) {
  61. 							ans[i] = K[k + 1];
  62. 							sw1 = true;
  63. 							break;
  64. 						}
  65. 					}
  66. 					break;
  67. 				}
  68. 			}
  69. 			if (!sw1) {
  70. 				N_digits -= 1;
  71. 				i = N_digits;
  72. 				sw1 = true;
  73. 			}
  74. 		}
  75. 	}
  76.  
  77. 	for (int i = N_digits - 1; i >= 0; i--) {
  78. 		cout << ans[i];
  79. 	}
  80. 	return 0;
  81. }
Success #stdin #stdout 0s 5320KB
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stdin
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7654321 2
6 7
stdout
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6777777
https://ideone.com/J6tuTV
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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