Submission #673333

#	Time	Username	Problem	Language	Result	Execution time	Memory
673333		smartmonky	Biochips (IZhO12_biochips)	C++14	10 / 100	248 ms	290980 KiB

biochips

#include <bits/stdc++.h>

#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long

using namespace std;

void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
const int N = 200005;
vector <int> g[N];
int coast[N], dp[500][N];
int m;
void dfs(int v){
	for(auto to : g[v]){
		dfs(to);
		for(int i = m; i > 0; i--){
			dp[i][v] = max(dp[i - 1][v] + dp[1][to], dp[i][v]);
		}
	}
	dp[1][v] = max(dp[1][v], coast[v]);
}
main(){
	ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
	//fp("game");
	int n;
	cin >> n >> m;
	int ind = -1;
	for(int i = 0; i < n; i++){
		int a, b;
		cin >> a >> b;
		coast[i + 1] = b;
		if(a == 0){
			ind = i + 1;
			continue;
		}
		g[a].pb(i + 1);
	}
	dfs(ind);
	cout << dp[m][ind];
}

Compilation message (stderr)

biochips.cpp:26:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   26 | main(){
      | ^~~~
biochips.cpp: In function 'void fp(std::string)':
biochips.cpp:12:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
biochips.cpp:12:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 100