Submission #656498

#	Time	Username	Problem	Language	Result	Execution time	Memory
656498		Do_you_copy	Biochips (IZhO12_biochips)	C++17	100 / 100	577 ms	398852 KiB

biochips

/*
    Procrastination is the art of keeping up with yesterday
*/
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 2e5 + 10;
//const int Mod = 1e9 + 7;
//const int inf =
int n, m;
int root;
vector <int> adj[maxN];
int dp[maxN][502];
int sz[maxN];
int tem[502];
int a[maxN];
void dfs(int u = root){
    sz[u] = 1;
    memset(tem, 0, sizeof(tem));
    for (int v: adj[u]){
        dfs(v);
        for (int i = 0; i <= min(m, sz[u]); ++i){
            for (int j = 0; j <= min(m - i, sz[v]); ++j){
                tem[i + j] = max(tem[i + j], dp[u][i] + dp[v][j]);
            }
        }
        sz[u] += sz[v];
        for (int i = 1; i <= min(m, sz[u]); ++i) dp[u][i] = tem[i];
    }
    dp[u][1] = max(dp[u][1], a[u]);
}


void Init(){
    cin >> n >> m;
    for (int i = 1; i <= n; ++i){
        int x; cin >> x >> a[i];
        if (x) adj[x].pb(i);
        else root = i;
    }
    dfs();
    cout << dp[root][m];
}

#define debug
#define taskname "test"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100