Submission #285713

#	Time	Username	Problem	Language	Result	Execution time	Memory
285713		Kastanda	Friend (IOI14_friend)	C++11	100 / 100	38 ms	2296 KiB

friend

// M
#include<bits/stdc++.h>
#include "friend.h"
using namespace std;
const int N = 100005;
int n, dp[N][2];

int findSample(int _n, int confidence[], int host[], int protocol[])
{
        n = _n;
        for (int i = 0; i < n; i ++)
                dp[i][1] = confidence[i], dp[i][0] = 0;

        for (int i = n - 1; i; i --)
        {
                int p = host[i];
                if (protocol[i] == 0)
                {
                        dp[p][1] += dp[i][0];
                        dp[p][0] += max(dp[i][0], dp[i][1]);
                }
                else if (protocol[i] == 1)
                {
                        dp[p][1] += max(dp[i][0], dp[i][1]);
                        dp[p][1] = max(dp[p][1], dp[p][0] + dp[i][1]);
                        dp[p][0] += dp[i][0];
                }
                else
                {
                        dp[p][1] += dp[i][0];
                        dp[p][1] = max(dp[p][1], dp[p][0] + dp[i][1]);
                        dp[p][0] += dp[i][0];
                }
        }
        return max(dp[0][0], dp[0][1]);
}

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