Submission #64352

#	Time	Username	Problem	Language	Result	Execution time	Memory
64352		theknife2001	Dreaming (IOI13_dreaming)	C++17	0 / 100	64 ms	10616 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"
#define ii pair< int , int >
#define se second
#define fi first

using namespace std;
const int N=1e5+55;
vector < ii > vec[N];
bool visited[N];
int root;
int d;
int l=1e9+5000;

int dfs(int u , int p ,bool q)
{
//    cout<<u<<' '<<p<<endl;
    visited[u]=1;
    int d1=0,d2=0;
    int v,c;
    int temp=0;
    for(auto x:vec[u])
    {
        v=x.fi;
        c=x.se;
        if(v==p)
            continue;
        temp=dfs(v,u,q);
        temp+=c;
        if(temp>d2)
            d2=temp;
        if(d2>d1)
            swap(d1,d2);
    }
    if(!q&&d<d1+d2)
    {
        root=u;
        d=d1+d2;
    }
    if(q)
    {
        if(l>max(d1,d-d1))
            l=max(d1,d-d1);
    }
//    cout<<u<<' '<<d1<<' '<<d2<<' '<<l<<endl;
    return d1;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[])
{
    for(int i=0;i<N;i++)
    {
        vec[B[i]].push_back({A[i],T[i]});
        vec[A[i]].push_back({B[i],T[i]});
    }
    int l1=-1,l2;
    for(int i=0;i<N;i++)
    {
        if(visited[i]==0)
        {
            if(l1==-1)
            {
                dfs(i,0,0);
                l=1e9+5555;
                dfs(i,0,1);
                l1=l;
            }
            else
            {
                d=0;
                dfs(i,0,0);
                l=1e9+5000;
                dfs(i,0,1);
                l2=l;
            }
        }
    }
    return l1+l2+L;
}

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:79:14: warning: 'l2' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return l1+l2+L;
            ~~^~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 0 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23