oj.uz

답안 #721141

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
721141 2023-04-10T11:19:47 Z stevancv 구슬과 끈 (APIO14_beads) C++14
0 / 100
 4 ms 5028 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 2e5 + 2;
const int inf = 1e9;
vector<pair<int, int>> g[N];
int dp[N][2];
void Dfs(int s, int e, int val) {
    vector<int> all;
    int sum = 0;
    for (auto z : g[s]) {
        int u = z.first; int v = z.second;
        if (u == e) continue;
        Dfs(u, s, v);
        sum += max(dp[u][0], dp[u][1]);
        all.push_back(v + dp[u][0] - max(dp[u][0], dp[u][1]));
    }
    sort(all.rbegin(), all.rend());
    dp[s][0] = sum;
    if (all.size() > 0) dp[s][1] = sum + all[0] + val;
    if (all.size() > 1) smax(dp[s][0], sum + all[0] + all[1]);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n; cin >> n;
    for (int i = 0; i < n - 1; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        g[u].push_back({v, w});
        g[v].push_back({u, w});
    }
    Dfs(1, 0, 0);
    cout << dp[1][0] << en;
    return 0;
}

Subtask #1
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 5024 KB Output is correct
4 Correct 3 ms 5024 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Incorrect 4 ms 5028 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 5024 KB Output is correct
4 Correct 3 ms 5024 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Incorrect 4 ms 5028 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 5024 KB Output is correct
4 Correct 3 ms 5024 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Incorrect 4 ms 5028 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4948 KB Output is correct
2 Correct 4 ms 4948 KB Output is correct
3 Correct 3 ms 5024 KB Output is correct
4 Correct 3 ms 5024 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Incorrect 4 ms 5028 KB Output isn't correct
7 Halted 0 ms 0 KB -