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Submission #867441

# Submission time Handle Problem Language Result Execution time Memory
867441 2023-10-28T11:51:52 Z sleepntsheep Biochips (IZhO12_biochips) C++17
80 / 100
 2000 ms 12748 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <deque>
#include <set>
#include <utility>
#include <array>

using namespace std;
#define ALL(x) x.begin(), x.end()
#define ShinLena cin.tie(nullptr)->sync_with_stdio(false);
#define N 200050
using ll = long long;

int n, m, a[N], timer, dp[2][N];
vector<int> g[N];
vector<tuple<int, int, int>> v;

void dfs(int u)
{
    int in = timer++;
    for (auto v : g[u]) dfs(v);
    int out = timer++;
    v.emplace_back(out, in, a[u]);
}

void schedule()
{
    for (int j = 1; j <= m; ++j)
    {
        for (auto i = 0; i < v.size(); ++i)
        {
            auto [e, s, w] = v[i];
            int l = 0, r = i-1;
            dp[j&1][i] = i?dp[j&1][i-1]:w;
            while (l <= r)
            {
                int y = (l+r)/2;
                if (get<0>(v[y]) < s)
                    dp[j&1][i] = max(dp[j&1][i], dp[!(j&1)][y] + w), l = y + 1;
                else r = y - 1;
            }
        }
    }
}

int main()
{
    ShinLena;
    cin >> n >> m;
    for (int p, i = 1; i <= n; ++i) cin >> p >> a[i], g[p].push_back(i);
    dfs(0);
    sort(ALL(v));
    schedule();
    cout << dp[m&1][v.size()-1];
    return 0;
}

Compilation message

biochips.cpp: In function 'void schedule()':
biochips.cpp:31:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::tuple<int, int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for (auto i = 0; i < v.size(); ++i)
      |                          ~~^~~~~~~~~~

Subtask #1
80.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6748 KB Output is correct
2 Correct 1 ms 6748 KB Output is correct
3 Correct 1 ms 6744 KB Output is correct
4 Correct 17 ms 7004 KB Output is correct
5 Correct 21 ms 7000 KB Output is correct
6 Correct 27 ms 7004 KB Output is correct
7 Correct 1924 ms 11468 KB Output is correct
8 Correct 1451 ms 12748 KB Output is correct
9 Execution timed out 2075 ms 12744 KB Time limit exceeded
10 Execution timed out 2045 ms 11716 KB Time limit exceeded