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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int maxN = 111;
  5. const int maxM = 11111;
  6. const int mod = 1e9 + 7;
  7.  
  8. int dp[maxN][maxM], n, m, k;
  9. vector<int> adj[ maxN ];
  10. void dfs(int u, int p=0) {
  11. 	for( auto it: adj[u] ) {
  12. 		if( it != p ) {
  13. 			dfs(it, u);
  14. 		}
  15. 	}
  16.  
  17. 	for(int y=1; y<=m; y++) {
  18. 		dp[u][y] = 1;
  19. 		for( auto it: adj[u] ) {
  20. 			if( it != p ) {
  21. 				int ans = dp[it][m]; // total sum
  22. 				int l, r; // finding range to be subtracted
  23. 				l = max(y - k + 1, 1);
  24. 				r = min(m, y + k - 1);
  25. 				if( l <= r ) {
  26. 					// subtracting range
  27. 					ans -= dp[it][r] - dp[it][l-1];
  28. 					if( ans < 0 ) ans += mod;
  29. 					if( ans > mod ) ans -= mod;
  30. 				}
  31. 				dp[u][y] = 1LL * dp[u][y] * ans % mod; 	
  32. 			}
  33. 		}
  34. 		dp[u][y] += dp[u][y-1]; // maintaining prefix sum
  35. 		if( dp[u][y] >= mod ) 
  36. 			dp[u][y] -= mod;
  37. 	}
  38. }
  39.  
  40. #define f_in(st) freopen(st,"r",stdin)
  41. #define f_out(st) freopen(st,"w",stdout)
  42.  
  43.  
  44. int main() {
  45. 	// f_in( "in10.txt" );
  46. 	// f_out( "output.txt" );
  47. 	int t; cin >> t;
  48. 	while( t-- ) {
  49. 		memset(dp, 0, sizeof dp);
  50. 		cin >> n >> m >> k;
  51. 		for(int i=1; i<n; i++) {
  52. 			int u, v; cin >> u >> v;
  53. 			adj[u].push_back(v);
  54. 			adj[v].push_back(u);
  55. 		}
  56. 		dfs(1, 0);
  57. 		cout << dp[1][m] << "\n";
  58. 		for(int i=1; i<=n; i++) adj[i].clear();
  59. 	}
  60. 	return 0;
  61. }
Time limit exceeded #stdin #stdout 5s 8280KB
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https://ideone.com/XMuLy1
language:
C++14 (gcc 8.3)
created:
7 years ago
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