#include <bits/stdc++.h> using namespace std; const int maxN = 111; const int maxM = 111; const int mod = 1e9 + 7; int dp[maxN][maxM], n, m, k; vector<int> adj[ maxN ]; void dfs(int u, int p=0) { for( auto it: adj[u]) if( it != p ) dfs(it, u); for(int y=1; y<=m; y++) { dp[u][y] = 1; for( auto it: adj[u] ) { if( it != p ) { int ans = 0; for(int i=1; i<=m; i++) { if(abs(i-y) >= k) { ans += dp[it][i]; if( ans >= mod ) ans -= mod; } } dp[u][y] = 1LL * dp[u][y] * ans % mod; } } } } #define f_in(st) freopen(st,"r",stdin) #define f_out(st) freopen(st,"w",stdout) int main() { // f_in( "in10.txt" ); // f_out( "output.txt" ); int t; cin >> t; while( t-- ) { memset(dp, 0, sizeof dp); cin >> n >> m >> k; for(int i=1; i<n; i++) { int u, v; cin >> u >> v; adj[u].push_back(v); adj[v].push_back(u); } dfs(1, 0); int ans = 0; for(int i=1; i<=m; i++) { ans += dp[1][i]; if( ans >= mod ) ans -= mod; } cout << ans << "\n"; for(int i=1; i<=n; i++) adj[i].clear(); } return 0; }
Standard input is empty
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