Submission #672418

#	Time	Username	Problem	Language	Result	Execution time	Memory
672418		Alihan_8	Biochips (IZhO12_biochips)	C++17	100 / 100	557 ms	395056 KiB

biochips

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
//#define int long long
const int N = 2e5+1;
vector <int> g[N];
vector <vector<int>> dp;
void chmax(int &l, int r){l = max(l, r);};
int sub[N], m;
void dfs(int n){
    sub[n] = 1;
    vector <int> Mx(m+1);
    for ( auto to: g[n] ){
        dfs(to);
        vector <int> cur(m+1);
        for ( int i = 0; i <= min(sub[n], m); i++ ){
            for ( int j = 0; j <= min(sub[to], m) and j+i <= m; j++ ){
                chmax(cur[i+j], Mx[i]+dp[to][j]);
            }
        }
        sub[n] += sub[to];
        for ( int i = 0; i <= min(m, sub[n]); i++ ) chmax(Mx[i], cur[i]);
    }
    for ( int i = 0; i <= min(m, sub[n]); i++ ) chmax(dp[n][i], Mx[i]);
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n; cin >> n >> m;
    int root = -1;
    dp.resize(n+1);
    for ( auto &i: dp ) i.resize(m+1);
    for ( int i = 1; i <= n; i++ ){
        int x; cin >> x >> dp[i][1];
        if ( x ) g[x].pb(i);
        else root = i;
    }
    dfs(root);
    cout << dp[root][m];

    cout << '\n';
}

Compilation message (stderr)

biochips.cpp: In function 'void IO(std::string)':
biochips.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100