Submission #877028

#	Time	Username	Problem	Language	Result	Execution time	Memory
877028		VahanAbraham	Biochips (IZhO12_biochips)	C++14	100 / 100	499 ms	410336 KiB

biochips

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <map>
#include <stack>
#include <set>
#include <queue>
#include <unordered_set>
#include <unordered_map>
#include <math.h>
#include <cmath>
#include <vector>
#include <iomanip>
#include <random>
#include <chrono>
using namespace std;

#define ll long long
#define fr first
#define sc second
#define pb push_back
#define US freopen("milkvisits.in", "r", stdin); freopen("milkvisits.out", "w", stdout);

ll gcd(ll a, ll b)
{
    if (a == 0 || b == 0) {
        return  max(a, b);
    }
    if (a <= b) {
        return gcd(a, b % a);
    }
    else {
        return gcd(a % b, b);
    }
}
ll lcm(ll a, ll b) {
    return (a / gcd(a, b)) * b;
}

const int N = 300005;
const ll oo = 1000000000000000, MOD = 1000000007;

vector<int> g[N];
int dp[N][505], n, m, weight[N], sz[N];

void dfs(int u, int p) {
    sz[u] = 1;
    for (int i = 0; i < g[u].size(); ++i) {
        int h = g[u][i];
        if (h != p) {
            dfs(h, u);
            sz[u] += sz[h];
            for (int j = min(sz[u], m); j >= 1; --j) {
                for (int k = 1; k <= min(sz[h], j); ++k) {
                    dp[u][j] = max(dp[u][j], dp[h][k] + dp[u][j - k]);
                }
            }
        }
    }
    dp[u][1] = max(dp[u][1], weight[u]);
}

void solve() {
    cin >> n >> m;
    int r = 1;
    for (int i = 1; i <= n; ++i) {
        int u, w;
        cin >> u >> w;
        if (u == 0) {
            r = i;
        }
        else {
            g[i].pb(u);
            g[u].pb(i);
        }
        weight[i] = w;
    }
    dfs(r, -1);
    cout << dp[r][m] << endl;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    //US
    int tt = 1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
}

Compilation message (stderr)

biochips.cpp: In function 'void dfs(int, int)':
biochips.cpp:52:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for (int i = 0; i < g[u].size(); ++i) {
      |                     ~~^~~~~~~~~~~~~

• Subtask 1: 100 / 100