Submission #766408

#	Time	Username	Problem	Language	Result	Execution time	Memory
766408		irmuun	Traffic (IOI10_traffic)	C++17	Compilation error	0 ms	0 KiB

traffic

#include<bits/stdc++.h>
#include "traffic.h"
 
using namespace std;
 
#define pb push_back
#define ll long long
#define ff first
#define ss second
#define all(s) s.begin(),s.end()

const int maxn=1e6;
const ll INF=1e18;
vector<int>adj[maxn],used(maxn,0),par(n);
ll tot[maxn];

int LocateCentre(int N, int P[], int S[], int D[]) {
    ll all=0;
    for(int i=0;i<N-1;i++){
        adj[S[i]].pb(D[i]);
        adj[D[i]].pb(S[i]);
    }
    for(int i=0;i<N;i++){
        all+=P[i];
    }
    function <void(int)> dfs=[&](int x){
        used[x]=1;
        tot[x]+=P[x];
        for(auto y:adj[x]){
            if(used[y]==0){
                par[y]=x;
                dfs(y);
                tot[x]+=P[y];
            }
        }
    };
    function <void(int,int)> num=[&](int x,int y){
        if(par[y]==x){
            return tot[y];
        }
        else{
            return all-tot[x];
        }
    };
    dfs(0);
    p[0]=-1;
    ll mn=INF,ans=0;
    for(int i=0;i<n;i++){
        ll curmin=INF;
        for(auto y:adj[i]){
            curmin=min(curmin,num(i,y));
        }
        if(curmin<mn){
            mn=curmin;
            ans=i;
        }
    }
    return ans;
}

Compilation message (stderr)

traffic.cpp:14:39: error: 'n' was not declared in this scope; did you mean 'yn'?
   14 | vector<int>adj[maxn],used(maxn,0),par(n);
      |                                       ^
      |                                       yn
traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:46:5: error: 'p' was not declared in this scope
   46 |     p[0]=-1;
      |     ^
traffic.cpp:48:19: error: 'n' was not declared in this scope
   48 |     for(int i=0;i<n;i++){
      |                   ^
traffic.cpp:51:34: error: invalid use of void expression
   51 |             curmin=min(curmin,num(i,y));
      |                               ~~~^~~~~