Submission #921787

#	Time	Username	Problem	Language	Result	Execution time	Memory
921787		sleepntsheep	Magic Tree (CEOI19_magictree)	C++17	0 / 100	1586 ms	1048576 KiB

magictree

#include <iostream>
#include <fstream>
#include <iomanip>
#include <cmath>
#include <cassert>
#include <cstring>
#include <vector>
#include <algorithm>
#include <deque>
#include <set>
#include <utility>
#include <array>
#include <complex>

using u32 = unsigned;
using i32 = int;
using i64 = long long;
using u64 = unsigned long long;
using f64 = double;
using f80 = long double;

#define int long long
using namespace std;
using pt = complex<f80>;
#define ALL(x) begin(x), end(x)
#define ShinLena cin.tie(nullptr)->sync_with_stdio(false);
#define N 100005

multiset<pair<int, i64>> s[N];


int n, m, k; 
i64 dp[N];
basic_string<int> g[N];

void dfs(int u)
{
    i64 nocur = 0, cur = 0, fruit = s[u].size(), d;
    if (fruit) tie(d, cur) = *s[u].begin();


    for (auto v : g[u])
    {
        dfs(v);
        nocur += dp[v];

        for (auto [x, y] : s[v])
        {
            if (fruit and x <= d) cur += y;
        }
    }


    if (fruit and cur > nocur)
    {
        dp[u] = cur;
        for (auto v : g[u])
        {
            for (auto [x, y] : s[v])
            {
                if (x <= d) s[u].insert({x, y});
            }
        }
    }
    else
    {
        dp[u] = nocur;
        s[u].clear();
        for (auto v : g[u])
        {
            for (auto [x, y] : s[v])
                s[u].insert({x, y});
        }
    }
}

signed main()
{
    ShinLena;
    cin >> n >> m >> k;
    for (int i = 2, p; i <= n; ++i) cin >> p, g[p].push_back(i);
    for (int v, d, w, i = 0; i < m; ++i)
    {
        cin >> v >> d >> w;
        s[v].emplace(d, w);
    }
    dfs(1);
    cout << dp[1];

    return 0;
}

Compilation message (stderr)

magictree.cpp: In function 'void dfs(long long int)':
magictree.cpp:49:23: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |             if (fruit and x <= d) cur += y;
      |                 ~~~~~~^~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 3
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17