Submission #28876

#	Time	Username	Problem	Language	Result	Execution time	Memory
28876		kavun	Race (IOI11_race)	C++14	21 / 100	3078 ms	12412 KiB

race

#include "race.h"
#include <bits/stdc++.h>

using namespace std;
vector <pair<int,int> > adj[300000];

void dfs(int v, int d, int length, int par, int& mn, int K)
{
    if(length == K)
    {
        mn = min(mn,d);
    }
    else if(length > K)
        return;
    
    for(int i = 0; i < adj[v].size(); i++)
    {
        int u = adj[v][i].first;
        if(u != par)
            dfs(u,d+1,length + adj[v][i].second,v,mn, K);
    }
    
}

int best_path(int N, int K, int H[][2], int L[])
{
    for(int i = 0; i < N-1; i++)
    {
        int v = H[i][0],u = H[i][1],l = L[i];
        adj[v].push_back(make_pair(u,l));
        adj[u].push_back(make_pair(v,l));
    }
    
    int mn = 1e9;
    for(int i = 0; i < N; i++)
    {
        dfs(i,0,0,i,mn,K);
    }
  if(mn == 1e9)
    return -1;
  return mn;
}

Compilation message (stderr)

race.cpp: In function 'void dfs(int, int, int, int, int&, int)':
race.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < adj[v].size(); i++)
                    ~~^~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57