Submission #86872

#	Time	Username	Problem	Language	Result	Execution time	Memory
86872		Just_Solve_The_Problem	Biochips (IZhO12_biochips)	C++17	0 / 100	3 ms	1148 KiB

biochips

#include <iostream>
#include <memory.h>

using namespace std;

const int N = (int)200 + 1;
const int M = (int)500 + 1;
const int inf = (int)1e9 + 7;

int n;
int pr[N], w[N];
int root;
int dp[N][M];
int dpg[N][M];
int prv[N], lst[N];

int f(int, int);
int g(int, int);

int g(int v, int m) {
	if (m == 0) return 0;
	if (v < 0) {
		return -inf;
	}
	int &res = dpg[v][m];
	if (res != -1) return res;
	res = -inf;
	for (int j = 0; j <= m; j++) {
		res = max(res, f(v, j) + g(prv[v], m - j));
	}
	//cout << "g -> " << v << ' ' << m << ' ' << res << endl;
	return res;
}

int f(int v, int m) {
	if (m == 0) {
		return 0;
	}
	if (lst[v] == -1) {
		if (m == 1) return w[v];
		return -inf;
	}
	int &res = dp[v][m];
	if (res != -1) 
		return res;
	res = -inf;
	if (m == 1) {
		res = max(w[v], g(lst[v], m));
	}	else {
		res = g(lst[v], m);
	}
	//cout << "f -> " << v << ' ' << m << ' ' << res << endl;
	return res;
}

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int m;
	memset(dp, -1, sizeof dp);
	memset(dpg, -1, sizeof dpg);
	memset(lst, -1, sizeof lst);
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		cin >> pr[i] >> w[i];
		if (!pr[i]) {
			root = i;
		} else {
			prv[i] = lst[pr[i]];
			lst[pr[i]] = i;
		}
	}
	prv[root] = -1;
	cout << f(root, m);
}

Compilation message (stderr)

biochips.cpp:56:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

• Subtask 1: 0 / 100