Submission #589964

#	Time	Username	Problem	Language	Result	Execution time	Memory
589964		Dan4Life	Friend (IOI14_friend)	C++17	8 / 100	4 ms	5116 KiB

friend

#include <bits/stdc++.h>
#if !defined(LOL)
    #include "friend.h"
#endif
using namespace std;
 
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int maxn = (int)2e5+10;
vector<int> adj[maxn];
int used[maxn];

void add_edge(int a, int b){
    adj[a].pb(b); adj[b].pb(a);
}

void add_friends(int a, int b){
    for(auto u : adj[a]) add_edge(u,b);
}

bool chk(int s){
    for(auto u : adj[s])
        if(used[u]) return false;
    return true;
}

int findSample(int n, int c[], int h[], int pro[])
{
    return *max_element(c,c+n);
    int ans = 0;
    for(int i = 1; i < n; i++){
        if(pro[i]!=1) add_edge(h[i],i);
        if(pro[i]) add_friends(h[i],i);
        int cnt = 0, sum = 0;
        for(auto u : adj[h[i]]) cnt+=used[u], sum+=c[u];
        if(sum<=c[i] and cnt==sz(adj[h[i]])){
            for(auto u : adj[h[i]]) used[u]=0;
            ans-=sum, ans+=c[i];
            used[i]=1;
        }
    }
    return ans;
}

#if defined(LOL)

int main(void)
{
    #define __MAXSIZE__ 100002
    int confidence[__MAXSIZE__];
    int host[__MAXSIZE__];
    int protocol[__MAXSIZE__];
    int n,i;

    // Number of people
    assert(scanf("%d",&n)==1);
    
    // Confidence
    for(i=0;i<n;i++)
        assert(scanf("%d",&confidence[i])==1);
    
    // Host and Protocol
    for(i=1;i<n;i++)
        assert(scanf("%d %d",&host[i],&protocol[i])==2);
    
    // Answer
    printf("%d\n",findSample(n,confidence,host,protocol));
    return 0;
}
#endif

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