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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int maxN = 111;
  5. const int maxM = 111;
  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. 	for(int y=1; y<=m; y++) {
  15. 		dp[u][y] = 1;
  16. 		for( auto it: adj[u] ) {
  17. 			if( it != p ) {
  18. 				int ans = 0;
  19. 				for(int i=1; i<=m; i++) {
  20. 					if(abs(i-y) >= k) {
  21. 						ans += dp[it][i];
  22. 						if( ans >= mod ) ans -= mod;
  23. 					}
  24. 				}
  25. 				dp[u][y] = 1LL * dp[u][y] * ans % mod; 	
  26. 			}
  27. 		}
  28. 	}
  29. }
  30.  
  31. #define f_in(st) freopen(st,"r",stdin)
  32. #define f_out(st) freopen(st,"w",stdout)
  33.  
  34.  
  35. int main() {
  36. 	// f_in( "in10.txt" );
  37. 	// f_out( "output.txt" );
  38. 	int t; cin >> t;
  39. 	while( t-- ) {
  40. 		memset(dp, 0, sizeof dp);
  41. 		cin >> n >> m >> k;
  42. 		for(int i=1; i<n; i++) {
  43. 			int u, v; cin >> u >> v;
  44. 			adj[u].push_back(v);
  45. 			adj[v].push_back(u);
  46. 		}
  47. 		dfs(1, 0);
  48. 		int ans = 0;
  49. 		for(int i=1; i<=m; i++) {
  50. 			ans += dp[1][i];
  51. 			if( ans >= mod ) ans -= mod;
  52. 		}
  53. 		cout << ans << "\n";
  54. 		for(int i=1; i<=n; i++) adj[i].clear();
  55. 	}
  56. 	return 0;
  57. }
Runtime error #stdin #stdout 0.19s 3508KB
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https://ideone.com/fg2zl2
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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