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  1. #include <bits/stdc++.h>
  2. using namespace std; 
  3.  
  4. int n, L;   
  5. int a[25]; 
  6. int ans;  
  7.  
  8. void backtrack(int i, int X, int Y, int cnt) {
  9. 	if (i == n + 1) {
  10. 		ans = min(ans, cnt); 
  11. 		return; 
  12. 	}
  13.  
  14. 	// Thêm vào thùng 1 
  15. 	if (X - a[i] >= 0) {
  16. 		backtrack(i + 1, X - a[i], Y, cnt);  
  17. 	}
  18. 	else {
  19. 		backtrack(i + 1, L - a[i], Y, cnt + 1); 
  20. 	}
  21.  
  22. 	// Thêm vào thùng 2
  23. 	if (Y - a[i] >= 0) {
  24. 		backtrack(i + 1, X, Y - a[i], cnt);   
  25. 	}
  26. 	else {
  27. 		backtrack(i + 1, X, L - a[i], cnt + 1); 
  28. 	}
  29. }
  30.  
  31. void do_sub1() {
  32. 	ans = 1e9;  
  33. 	backtrack(1, L, L, 2); 
  34. 	cout << ans << '\n';   
  35. }
  36.  
  37. int main() {
  38. 	ios::sync_with_stdio(0); cin.tie(0); 
  39. 	cin >> L >> n;   
  40. 	for (int i = 1; i <= n; i++) cin >> a[i];  
  41.  
  42. 	if (L <= 1e9 && n <= 20) do_sub1();  
  43. }
  44.  
Success #stdin #stdout 0.01s 5312KB
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8 6
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3
https://ideone.com/Uf3Dqs
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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