Submission #107245

#	Time	Username	Problem	Language	Result	Execution time	Memory
107245		batmend_kh	Friend (IOI14_friend)	C++14	46 / 100	41 ms	4480 KiB

friend

#include "friend.h"
#include<bits/stdc++.h> 
using namespace std;

int answer = 0;
vector<int> adj[1005];
int dp_get[1005], dp_didnt_get[1005];

void dp (int current, int parent, int confidence[]) {
	dp_get[current] = confidence[current];
	bool leaf = 1;
	for (int x : adj[current]) {
		if (x == parent) continue;
		leaf = 0;
		dp(x, current, confidence);
	}
	if (leaf) return;
	for (int x : adj[current]) {
		if (x == parent) continue;
		dp_get[current] += dp_didnt_get[x];
		dp_didnt_get[current] += max(dp_didnt_get[x], dp_get[x]);
	}
}

int findSample(int n, int confidence[],int host[],int protocol[]){
	for (int i = 1; i < n; i++) {
			if (protocol[i] == 1 || protocol[i] == 2) {
				for (int x : adj[host[i]]) {
					adj[x].push_back(i);
					adj[i].push_back(x);
				}
			}
			if (protocol[i] == 0 || protocol[i] == 2) {
				adj[i].push_back(host[i]);
				adj[host[i]].push_back(i);
			}
	}	
	if (n <= 10) {
		for (int i = 0; i < (1<<n); i++) {
			vector<int> group;
			bool found_connectedness = 0;
			for (int j = 0; j < n; j++) {
				if (i & (1<<j)) group.push_back(j);
			}
			for (int i : group) {
				for (int j : group) {
					for (int x : adj[i]) if ( x == j) found_connectedness = 1;
				}
			}
			if (found_connectedness == 1) continue;
			int sum = 0;
			for (int x : group) sum += confidence[x];
			answer = max(answer, sum);
		}
		return answer;
	}
	bool all0 = 1, all1 = 1, all2 = 1;
	for (int i = 1; i < n; i++) {
		if (protocol[i] == 0) {
			all1 = 0;
			all2 = 0;
		}
		if (protocol[i] == 1) {
			all0 = 0;
			all2 = 0;
		}
		if (protocol[i] == 2) {
			all0 = 0;
			all1 = 0;
		}
	}

	if (all1 == 1) {
		int sum = 0;
		for (int i = 0; i < n; i++) sum += confidence[i];
		return sum;
	}
	if (all2 == 1) {
		int ma = 0;
		for (int i = 0; i < n; i++) ma = max(ma, confidence[i]);
		return ma;
	}
	if (all0 == 1) {
		dp(0, -1, confidence);
		return max(dp_get[0], dp_didnt_get[0]);
	}
}

Compilation message (stderr)

friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:87:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 11 / 11
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31