Submission #424265

#	Time	Username	Problem	Language	Result	Execution time	Memory
424265		Charis02	Friend (IOI14_friend)	C++14	19 / 100	1 ms	460 KiB

friend

#include "friend.h"
#include<iostream>
#include<vector>
#include<string.h>
#define rep(i,a,b) for(int i = a;i < b;i++)
#define N 1004

using namespace std;

vector < int > graph[N];
int conf[N];
int id[N];
int dp[N][2];

int calc(int cur,int par,int choose)
{
    int res = 0;

    if(dp[cur][choose]!=-1)
        return dp[cur][choose];

    if(choose)
    {
        res = conf[cur];

        rep(i,0,graph[cur].size())
        {
            int v = graph[cur][i];

            if(v == par)
                continue;
            res += calc(v,cur,0);
        }
    }
    else
    {
        rep(i,0,graph[cur].size())
        {
            int v = graph[cur][i];

            if(v == par)
                continue;
            res += max(calc(v,cur,0),calc(v,cur,1));
        }
    }

    return dp[cur][choose] = res;
}

int findSample(int n,int confidence[],int host[],int protocol[])
{
    rep(i,0,n)
        id[i] = i;

    rep(i,0,n)
    {
        conf[i] = confidence[i];
        if(i == 0)
            continue;

        if(protocol[i] == 0)
        {
            graph[id[host[i]]].push_back(id[i]);
            graph[id[i]].push_back(id[host[i]]);
        }
        else
        {
            id[i] = host[i];
            conf[host[i]]++;
        }
    }

    memset(dp,-1,sizeof dp);

	return max(calc(1,1,0),calc(1,1,1));
}

Compilation message (stderr)

friend.cpp: In function 'int calc(int, int, int)':
friend.cpp:5:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define rep(i,a,b) for(int i = a;i < b;i++)
......
   26 |         rep(i,0,graph[cur].size())
      |             ~~~~~~~~~~~~~~~~~~~~~   
friend.cpp:26:9: note: in expansion of macro 'rep'
   26 |         rep(i,0,graph[cur].size())
      |         ^~~
friend.cpp:5:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define rep(i,a,b) for(int i = a;i < b;i++)
......
   37 |         rep(i,0,graph[cur].size())
      |             ~~~~~~~~~~~~~~~~~~~~~   
friend.cpp:37:9: note: in expansion of macro 'rep'
   37 |         rep(i,0,graph[cur].size())
      |         ^~~

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