| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 501213 | blue | 친구 (IOI14_friend) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "friend.h"
#include <vector>
using namespace std;
// Find out best sample
int findSample(int n,int confidence[],int host[],int protocol[])
{
vector<int> Yes(n, 0), No(n, 0); //dp if person i is chosen / not chosen
for(int i = 0; i < n; i++) Yes[i] += confidence[i];
for(int i = n-1; i >= 1; i--)
{
if(protocol[i] == 0) //I am your friend
{
//yes i, yes host[i]
//no i, yes host[i]
Yes[ host[i] ] += No[i];
//yes i, no host[i]
//no i, no host[i]
No[ host[i] ] += max(Yes[i], No[i]);
}
else if(protocol[i] == 1) //My friends are your friends
{
//yes i, yes host[i]
//no i, yes host[i]
//yes i, no host[i]
Yes[ host[i] ] = max(Yes[ host[i] ] + max(Yes[i], No[i]));//, No[ host[i] ] + Yes[i]);
//no i, no host[i]
No[ host[i] ] += No[i];
}
else //We are your friends
{
//yes i, yes host[i]
//no i, yes host[i]
//yes i, no host[i]
Yes[ host[i] ] = max(Yes[ host[i] ] + No[i], No[ host[i] ] + Yes[i]);
//no i, no host[i]
No[ host[i] ] += No[i];
}
}
return max(Yes[0], No[0]);
}