제출 #1075873

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1075873		edogawa_something	Simurgh (IOI17_simurgh)	C++17	30 / 100	82 ms	26712 KiB

simurgh

#include "simurgh.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
#define F first
#define S second
#define all(v) v.begin(),v.end()
#define pb push_back
const ll M=250000;
vector<pii> adj[M];
bool vis[M];
vii sp;
void dfs(ll x) {
  vis[x]=1;
  for(auto it:adj[x]) {
    if(vis[it.F])
      continue;
    else {
      sp.pb(it.S);
      dfs(it.F);
    }
  }
}
struct dsu {
  ll sz[250],pa[250];
  void init(ll x) {
    for(int i=0;i<x;i++)
      sz[i]=1,pa[i]=i;
  }
  ll get(ll x) {
    if(x==pa[x])
      return x;
    return pa[x]=get(pa[x]);
  }
  void unite(ll x,ll y) {
    x=get(x),y=get(y);
    if(x==y)
      return;
    if(sz[x]>sz[y])
      swap(x,y);
    pa[x]=y;
    sz[y]+=sz[x];
  }
  bool same(ll x,ll y) {
    return get(x)==get(y);
  }
}d;
ll cnt[M],cc[M];
bool a[M];
set<ll>s;
vector<int> find_roads(int n, std::vector<int> u, std::vector<int> vv) {
  for(int i=0;i<u.size();i++)
    adj[u[i]].pb({vv[i],i}),adj[vv[i]].pb({u[i],i});
  dfs(0);
  vector<int>ans,res;
  for(int i=0;i<u.size();i++)
    vis[i]=0;
  ll cc=0;
  for(auto it:sp) {
    s.clear();
    ans.clear();
    d.init(n);
    vii v;
    for(auto itt:sp) {
      if(itt!=it)
        ans.pb(itt),d.unite(u[itt],vv[itt]);
    }
    for(int i=0;i<u.size();i++)
      cnt[i]=0;
    for(int i=0;i<u.size();i++) {
      if(!d.same(u[i],vv[i])) {
        ans.pb(i);
        ll x=count_common_roads(ans);
        cc++;
        cnt[ans.back()]=x;
        s.insert(x);
        v.pb(i);
        ans.pop_back();
      }
    }
    if(s.size()==1) {
      bool cc[2];
      cc[0]=cc[1]=0;
      for(int i=0;i<u.size();i++) {
        if(!d.same(u[i],vv[i])&&vis[i]&&!cc[a[i]]) {
          cc[a[i]]=1;
          ans.pb(i);
          s.insert(count_common_roads(ans));
          ans.pop_back();
        }
      }
    }
    for(auto it:v) {
      vis[it]=1;
      if(cnt[it]==*s.rbegin()) {
        a[it]=1;
      }
    }
  }
  for(int i=0;i<u.size();i++)
    if(a[i])res.pb(i);
  //assert(res.size()==n-1);
  assert(cc<=30000);
  return res;
}
/*
5 10
0 1
0 2
0 3
0 4
1 2
1 3
1 4
2 3
2 4
3 4
3 6 8 9

*/

컴파일 시 표준 에러 (stderr) 메시지

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:54:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |   for(int i=0;i<u.size();i++)
      |               ~^~~~~~~~~
simurgh.cpp:58:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |   for(int i=0;i<u.size();i++)
      |               ~^~~~~~~~~
simurgh.cpp:70:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     for(int i=0;i<u.size();i++)
      |                 ~^~~~~~~~~
simurgh.cpp:72:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |     for(int i=0;i<u.size();i++) {
      |                 ~^~~~~~~~~
simurgh.cpp:86:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |       for(int i=0;i<u.size();i++) {
      |                   ~^~~~~~~~~
simurgh.cpp:102:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |   for(int i=0;i<u.size();i++)
      |               ~^~~~~~~~~

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