Submission #1083569

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083569		jay22	Friend (IOI14_friend)	C++14	100 / 100	17 ms	3556 KiB

friend

#include <algorithm>
 
const int LEN = 1'000'001;
int w[LEN], dp[LEN][2];
 
int findSample(int n, int confidence[], int host[], int protocol[]) {
    for (int i = 0; i < n; ++i) dp[i][1] = confidence[i];
	for (int i = n - 1; i; --i) {
		if (protocol[i] == 0) {
			dp[host[i]][1] += dp[i][0];
			dp[host[i]][0] += std::max(dp[i][0], dp[i][1]);
		}
		if (protocol[i] == 1) {
			dp[host[i]][1] = std::max({ dp[host[i]][1] + dp[i][1], dp[host[i]][0] + dp[i][1], dp[host[i]][1] + dp[i][0] });
			dp[host[i]][0] += dp[i][0];
		}
		if (protocol[i] == 2) {
			dp[host[i]][1] = std::max(dp[host[i]][0] + dp[i][1], dp[host[i]][1] + dp[i][0]);
			dp[host[i]][0] += dp[i][0];
		}
	}
    return std::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