Submission #581770

#	Time	Username	Problem	Language	Result	Execution time	Memory
581770		HunterXD	Graph (BOI20_graph)	C++17	0 / 100	2 ms	256 KiB

Graph

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double dl;
typedef pair<int,int> ii;
typedef vector <int> vi;
typedef vector <ll> vl;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef vector <char> vc;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vc> vvc;
typedef vector<vs> vvs;
typedef pair<ll,ll> pl;
typedef double dou;
typedef vector<pl> vpl;
typedef unsigned long long ull;
typedef uint64_t i64;
typedef vector<ull> vull;

#define f first 
#define s second 
#define pb push_back 
#define sz(x) int((x).size())
#define all(x) begin(x), end(x)
#define ts to_string
#define lb lower_bound 
#define ub upper_bound
#define yes cout<<'Y'<<'E'<<'S'<<endl
#define no cout<<'N'<<'O'<<endl
#define nd "\n"

void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
 
ll gcd(ll a, ll b) {return b == 0 ? a : gcd(b, a % b);}
ll mcm(ll a, ll b) {return (a * b) / gcd(a, b);}
bool prime(ll n) {for(int i=2; i<=sqrt(n); i++) if(n%i==0) return false; return true;}
struct compii{bool operator()(const ii &a, const ii &b){if(a.f==a.s)return a.s<b.s;return a.f>b.f;}};
bool comp(int a, int b) {return a>b;}
ll binpow(ll n, ll x){ll ans=1; while(x){if(x&1){ans*=n;}n*=n; x>>=1;} return ans;}

namespace operators {
template<typename T1, typename T2>istream& operator>>(istream& in, pair<T1, T2>& x){in >> x.first >> x.second;return in;}
template<typename T1, typename T2>ostream& operator<<(ostream& out, pair<T1, T2> x){out << x.first << " " << x.second;return out;}
template<typename T1>istream& operator>>(istream& in, vector<T1>& x) {for (auto& i : x) in >> i;return in;}
template<typename T1>ostream& operator<<(ostream& out, vector<T1>& x) {for (auto& i : x) out << i << " ";return out;}
template<typename T1, typename T2>ostream& operator<<(ostream& out, vector<pair <T1,T2>>& x) {for (auto& i : x) out << i.f << " "<<i.s;return out;}
template<typename T1, typename T2>istream& operator>>(istream& in, vector<pair <T1,T2>>& x) {for (auto& i : x) in >> i.f >>i.s;return in;}
}

using namespace operators;

int dx[]= {1,0,-1,0};
int dy[]= {0,1,0,-1};

const int pmod = 998244353;
const int mod = 1e9+7;
const ll inf=1e18;

ll sum(ll a, ll b){
  return (( (a+mod) %mod) + ((b+mod)%mod))%mod;
}

ll multi(ll a, ll b){
  return (((a+mod) %mod) * ((b+mod)%mod))%mod;
}

///

dl x;
bool can = true, xfind;
vector<bool> seenDFS, seenVAL;
vector<pl> my;
vector<ll> pending;
vector<dl> val;
vector< vector<ll> > graphB, graphR;

void dfs(ll u, pl next){
  pending.pb(u);
  seenDFS[u] = true;
  my[u] = next;

  pl nextB = next;
  nextB.f *= -1;
  nextB.s = 1-next.s;

  pl nextR = next;
  nextR.f *= -1;
  nextR.s = 2-next.s;

  pl p1, p2;

  for(auto v: graphB[u]){
    if(!seenDFS[v]){
      dfs(v, nextB);
    }
    else{
      if(nextB != my[v]){
        if(nextB.f == my[v].f){
          can = false; 
        }
        else{
          x = (my[v].s-nextB.s)/( (dl) (nextB.f - my[v].f) );
          xfind = true;
        } 
      }
    }
  }

  for(auto v: graphR[u]){
    if(!seenDFS[v]){
      dfs(v, nextR);
    }
    else{
      if(nextR != my[v]){
        if(nextR.f == my[v].f){
          can = false; 
        }
        else{
          x = (my[v].s-nextR.s)/( (dl) (nextR.f - my[v].f) );
          xfind = true;
        } 
      }
    }
  }

}

void dfs_assign(ll u){
  seenVAL[u] = true;
  val[u] = (dl) (my[u].f*x + my[u].s); 

  for(auto v: graphB[u]){
    if(!seenVAL[v]){
      dfs_assign(v);
    }
  }

  for(auto v: graphR[u]){
    if(!seenVAL[v]){
      dfs_assign(v);
    }
  }
}

dl calc_val(ll med){
  dl res = 0;
  for(auto u: pending){
    res += abs(my[u].f*med + my[u].s); 
  }
  return res;
}

void calc_res(ll i){

  ll m = pending.size();

  vector<ll> pos, neg, tod;
  ll half = m/2, bestAns = m+100;

  for(auto v: pending){
    if(my[v].f == 1){
      pos.pb(-1*my[v].s);
      tod.pb(-1*my[v].s);
    }
    else{
      neg.pb(my[v].s);
      tod.pb(my[v].s);
    }
  }

  sort(all(pos), greater<ll>());
  sort(all(neg));

  vector<ll>::iterator it;
  ll tempAns, t1, t2;
  for(auto v: tod){
    
    t1 = 0; t2 = 0;
    ll t1ini = 0, t1fini = pos.size()-1, t1med;
    ll t1res = inf;
    bool t1can = false;
    while(t1ini <= t1fini){
      t1med = (t1ini+t1fini+1)/2;
      if(v >= pos[t1med]){
        t1can = true;
        t1res = min(t1res, t1med);
        t1ini = t1med+1;
      }
      else{
        t1fini = t1med-1;
      }
    }

    if(t1can){
      t1 = pos.size() - t1res;
    }

    ll t2ini = 0, t2fini = neg.size()-1, t2med;
    ll t2res = -1*inf;
    bool t2can = false;
    while(t2ini <= t2fini){
      t2med = (t2ini+t2fini+1)/2;
      if(v <= neg[t2med]){
        t2can = true;
        t2res = max(t2res, t2med);
        t2ini = t2med+1;
      }
      else{
        t2fini = t2med-1;
      }
    }
    if(t2can){
      t2 = t2res+1;
    }

    tempAns = t1 + t2;
    if(abs(half-tempAns) < abs(half-bestAns) ){
      bestAns = v;
    }
  }

  x = bestAns;
  dfs_assign(i);
}

void solve(){
  ll n, m;
  cin >> n >> m;

  graphB.assign(n+1, vector<ll>());
  graphR.assign(n+1, vector<ll>());
  val.assign(n+1, 0);
  seenDFS.assign(n+1, false);
  seenVAL.assign(n+1, false);
  my.assign(n+1, {1, 0});

  ll a[m], b[m], c[m];
  for(ll i = 0; i < m; i++){
    cin >> a[i] >> b[i] >> c[i];
    if(c[i] == 1){
      graphB[a[i]].pb(b[i]);
      graphB[b[i]].pb(a[i]);
    }
    else{
      graphR[a[i]].pb(b[i]);
      graphR[b[i]].pb(a[i]);
    }
  }
  
  for(ll i = 1; i <= n; i++){
    if(!seenDFS[i]){
      pending.clear();
      xfind = false;
      dfs(i, {1, 0});
      if(xfind){
        dfs_assign(i);
      }
      else{
        calc_res(i);
      }
    }
  }

  if(!can){
    no; 
    return;
  }

  yes;
  for(ll i = 1; i <= n; i++){
    cout << val[i] << " ";
  }
  cout << endl;

}

int main (){
  setIO("");
  int t = 1;
  //cin >> t;
  while(t-->0) solve();
  return 0;
}

Compilation message (stderr)

Graph.cpp: In function 'void setIO(std::string)':
Graph.cpp:35:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
      |                                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Graph.cpp:35:128: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void setIO(string name=""){ios_base::sync_with_stdio(0);cin.tie(0);if(sz(name)){freopen((name+".in").c_str(),"r",stdin);freopen((name+".out").c_str(),"w",stdout);}}
      |                                                                                                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 12
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 42