제출 #609677

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
609677		daria	기지국 (IOI20_stations)	C++17	0 / 100	944 ms	464 KiB

stations

#include"bits/stdc++.h"
#include "stations.h"
#include <vector>
using namespace std;
#define ll int

const ll N = 1000;

ll t = 0;
vector<ll> adj[N], lb(N, -1);

void dfs(ll s){
 if(lb[s]>=0) return;
 lb[s] = t++;
 for(auto u : adj[s])
  dfs(u);
 lb[s] += 2*N*(t++);
}

vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
 for(ll i=0; i<n-1; ++i){
  adj[u[i]].push_back(v[i]);
  adj[v[i]].push_back(u[i]);
 }
 dfs(0);
 vector<int> r(n);
 for(ll i=0; i<n; ++i) r[i] = lb[i];
 return r;
}

int find_next_station(int s, int t, std::vector<int> c) {
 ll x1 = s%(2*N); ll  y1 = s/(2*N);
 ll x2 = t%(2*N); ll  y2 = t/(2*N);
 //tempi di entrata e uscita dei target
 if(x1 > y2 || y1 < x2){
  for(auto u : c){
   ll x3 = u%(2*N); ll y3 = u/(2*N);
   if(x3 < x1 && y1 < x3) return u;
  }
 }
 for(auto u : c){
  ll x3 = u%(2*N); ll y3 = u/(2*N);
  if(x3 <= x2 && y2 <= x3) return u;
 }
 return c[0];
}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:37:24: warning: unused variable 'y3' [-Wunused-variable]
   37 |    ll x3 = u%(2*N); ll y3 = u/(2*N);
      |                        ^~
stations.cpp:42:23: warning: unused variable 'y3' [-Wunused-variable]
   42 |   ll x3 = u%(2*N); ll y3 = u/(2*N);
      |                       ^~

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