結果

問題 No.1488 Max Score of the Tree
ユーザー au7777
提出日時 2022-03-21 01:48:10
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 32 ms / 2,000 ms
コード長 3,345 bytes
コンパイル時間 4,040 ms
コンパイル使用メモリ 232,548 KB
実行使用メモリ 42,940 KB
最終ジャッジ日時 2024-10-07 20:22:41
合計ジャッジ時間 5,336 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 29
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#include <atcoder/all>
typedef long long int ll;
typedef long long int ull;
#define MP make_pair
using namespace std;
using namespace atcoder;
typedef pair<ll, ll> P;
const ll MOD = 998244353;
// const ll MOD = 1000000007;
using mint = modint998244353;
// using mint = modint1000000007;
const double pi = 3.1415926536;
const int MAX = 2000003;
long long fac[MAX], finv[MAX], inv[MAX];
void COMinit() {
fac[0] = fac[1] = 1;
finv[0] = finv[1] = 1;
inv[1] = 1;
for (int i = 2; i < MAX; i++){
fac[i] = fac[i - 1] * i % MOD;
inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
finv[i] = finv[i - 1] * inv[i] % MOD;
}
}
//
long long COM(int n, int k){
if (n < k) return 0;
if (n < 0 || k < 0) return 0;
return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}
ll gcd(ll x, ll y) {
if (y == 0) return x;
else if (y > x) {
return gcd (y, x);
}
else return gcd(x % y, y);
}
ll lcm (ll x, ll y) {
return x / gcd(x, y) * y;
}
ll my_sqrt(ll x) {
ll m = 0;
ll M = 3000000001;
while (M - m > 1) {
ll now = (M + m) / 2;
if (now * now <= x) {
m = now;
}
else {
M = now;
}
}
return m;
}
ll keta(ll n) {
ll ret = 0;
while (n) {
n /= 10;
ret++;
}
return ret;
}
ll ceil(ll n, ll m) {
// n > 0, m > 0
ll ret = n / m;
if (n % m) ret++;
return ret;
}
ll pow_ll(ll x, ll n) {
if (n == 0) return 1;
if (n % 2) {
return pow_ll(x, n - 1) * x;
}
else {
ll tmp = pow_ll(x, n / 2);
return tmp * tmp;
}
}
typedef struct {
int to;
int id;
} edge;
vector<edge> v[101];
int des[101]; // i
int cst[101]; // i
void dfs(int par, int cur, int now_id) {
int d = 0;
for (auto e : v[cur]) {
if (e.to == par) continue;
dfs(cur, e.to, e.id);
d += des[e.id];
}
if ((v[cur].size() == 0) || ((v[cur].size() == 1) && (v[cur][0].to == par))) d++;
des[now_id] = d;
}
int main() {
int n, k;
cin >> n >> k;
for (int i = 1; i <= n - 1; i++) {
int a, b, c;
cin >> a >> b >> c;
edge e1, e2;
e1.to = b;
e1.id = i;
cst[i] = c;
v[a].push_back(e1);
e2.to = a;
e2.id = i;
v[b].push_back(e2);
}
dfs(0, 1, 0);
// for (int i = 1; i <= n - 1; i++) {
// cout << des[i] << ' ' << cst[i] << endl;
// }
int dp[n + 1][k + 1]; // ij
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= k; j++) {
dp[i][j] = 0;
}
}
int first_ans = 0;
for (int i = 1; i <= n - 1; i++) {
first_ans += cst[i] * des[i];
}
// cout << first_ans << endl;
for (int i = 0; i < n; i++) {
for (int j = 0; j <= k; j++) {
dp[i + 1][j] = max(dp[i][j], dp[i + 1][j]); //
if (j + cst[i + 1] <= k) {
dp[i + 1][j + cst[i + 1]] = max(dp[i + 1][j + cst[i + 1]], dp[i][j] + des[i + 1] * cst[i + 1]);
}
}
}
int add = 0;
for (int i = 0; i <= k; i++) {
add = max(add, dp[n][i]);
}
cout << first_ans + add << endl;
return 0;
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0