Submission #697464

#	Time	Username	Problem	Language	Result	Execution time	Memory
697464		Deepesson	Friend (IOI14_friend)	C++17	Compilation error	0 ms	0 KiB

friend

#include <bits/stdc++.h>
#define MAX 1005
std::vector<int> con[MAX];
// Find out best sample
int findSample(int n,int confidence[],int host[],int protocol[]){
	for(int i=1;i!=n;++i){
        if(protocol[i]==0){
            int alfa = host[i];
            con[alfa].push_back(i);
            con[i].push_back(alfa);
        }else {
            for(auto&x:con[host[alfa]]){
                con[i].push_back(x);
                con[x].push_back(i);
            }
        }
	}
    bool foi[n]={};
    int cor[n]={};
    int ans=0;
    for(int i=0;i!=n;++i){
        if(foi[i])continue;
        std::queue<int> queue;
        queue.push(i);
        foi[i]=true;
        int alfa=0,beta=0;
        while(queue.size()){
            auto __ = queue.front();
            queue.pop();
            for(auto&x:con[__]){
                if(foi[x])continue;
                if(!cor[__])++alfa;else ++beta;
                cor[x]=!cor[__];
                queue.push(x);
                foi[x]=true;
            }
        }
        ans+=std::max(alfa,beta);
    }
    return ans;
}

Compilation message (stderr)

friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:12:33: error: 'alfa' was not declared in this scope
   12 |             for(auto&x:con[host[alfa]]){
      |                                 ^~~~