Submission #28791

#	Time	Username	Problem	Language	Result	Execution time	Memory
28791		dereotu	경주 (Race) (IOI11_race)	C++14	21 / 100	38 ms	3196 KiB

race

#include "race.h"
#include <bits/stdc++.h>
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define st first
#define nd second
#define forr(i,A,B) for(int i=A;i<B;++i)
#define space ' '
#define endl '\n'
#define LL long long
using namespace std;

vector <pair<int,int> > adj[1005];

int k,ans=1e9;

void dfs(int x,int y,int len,int step);

int best_path(int N, int K, int H[][2], int L[])
{
	for(int i=0;i<N;i++){
		adj[H[i][0]].pb(mp(L[i],H[i][1]));
		adj[H[i][1]].pb(mp(L[i],H[i][0]));
	}
	k=K;
	for(int i=0;i<N;i++){
		dfs(i,-1,0,0);
	}
	if(ans==1e9) return -1;
	else return ans;
}

void dfs(int x,int y,int len,int step){
	if(len==k){
		ans=min(ans,step);
		return;
	}
	for(int i=0;i<adj[x].size();i++){
		if(adj[x][i].nd!=y and adj[x][i].nd!=x){
			dfs(adj[x][i].nd,x,adj[x][i].st+len,step+1);
		}
	}
}

Compilation message (stderr)

race.cpp: In function 'void dfs(int, int, int, int)':
race.cpp:39:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<adj[x].size();i++){
              ~^~~~~~~~~~~~~~

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