// header file
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
// pragma
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
// macros
#define endl "\n"
#define ll long long
#define mp make_pair
#define ins insert
#define lb lower_bound
#define pb push_back
#define ub upper_bound
#define lll __int128
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
const int lim = 1e5 + 5, lim2 = 1e2 + 5;
// path rooted at index nd, with v breadcrumbs used
vector<int> edges[lim];
bool vis[lim];
ll res, sub[lim], dp[lim][lim2], v, par[lim], a[lim];
void dfs(int nd) {
vis[nd] = 1;
// take
ll sum_child = 0;
vector<int> child;
for(auto i : edges[nd]) {
if(!vis[i]) {
par[i] = nd;
dfs(i);
sub[nd] += a[i];
child.pb(i);
}
}
ll prmx[v + 1], prmx2[v + 1];
memset(prmx, 0, sizeof(prmx));
memset(prmx2, 0, sizeof(prmx2));
for(auto i : child) {
// transition
for(int j = 0; j <= v; ++j) {
// case current is root and combine 2 paths (with root not taken)
res = max(res, dp[i][j] + prmx[v - j]);
// case current is root and combine 2 paths (with root taken)
res = max(res, dp[i][j] + sub[nd] + a[par[nd]] + prmx2[v - j] - a[i]);
if(j != 0)
dp[nd][j] = max(dp[nd][j], dp[nd][j - 1]);
// not take
dp[nd][j] = max(dp[nd][j], dp[i][j]);
// take
if(j != 0)
dp[nd][j] = max(dp[nd][j], dp[i][j - 1] + sub[nd] - a[i]);
// case current is root and only single path (not combin of 2 paths)
res = max(res, dp[nd][j]);
// case current is root, only single path, and taken
if(j != 0)
res = max(res, dp[nd][j - 1] + sub[nd] + a[par[nd]] - a[i]);
}
for(int j = 1; j <= v; ++j) {
prmx[j] = max(prmx[j], dp[i][j]);
prmx2[j] = max(prmx2[j], dp[i][j] - a[i]);
}
}
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(NULL);
int n;
cin >> n >> v;
for(int i = 1; i <= n; ++i)
cin >> a[i];
for(int i = 1; i < n; ++i) {
int a, b;
cin >> a >> b;
edges[a].pb(b);
edges[b].pb(a);
}
dfs(1);
cout << res << endl;
return 0;
}
Compilation message
chase.cpp: In function 'void dfs(int)':
chase.cpp:31:6: warning: unused variable 'sum_child' [-Wunused-variable]
31 | ll sum_child = 0;
| ^~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
7004 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
7004 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
138 ms |
62324 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
2 ms |
7004 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
