Submission #918772

#	Time	Username	Problem	Language	Result	Execution time	Memory
918772		xynex	Split the Attractions (IOI19_split)	C++17	100 / 100	103 ms	34384 KiB

split

/**
  * Author: Tenjin
  * Created: 27.04.2022 18:58
  * Why am I so stupid? :c
  * Slishkom slab
**/

#include <bits/stdc++.h>

 #pragma GCC optimize("inline")
 #pragma GCC optimize("-fgcse,-fgcse-lm")
 #pragma GCC optimize("-ftree-pre,-ftree-vrp")
 #pragma GCC optimize("-ffast-math")
 #pragma GCC optimize("-fipa-sra")
 #pragma GCC optimize("-fpeephole2")
 #pragma GCC optimize("-fsched-spec")
 #pragma GCC optimize("Ofast,no-stack-protector")
 #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
 #pragma GCC optimize("unroll-loops")

using namespace std;

#define ll long long
#define pr pair
#define vt vector
#define ff first
#define ss second
#define sz(a) (int)a.size()
#define pb push_back
#define pf push_front
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

template<typename T> T get_rand(T l, T r) {
  random_device rd;
  mt19937 gen(rd());
  return uniform_int_distribution<T>(l, r)(gen);
}

template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(array<A, S>& a);
template<class T> void read(T& x) { cin >> x; }
void read(double& d) { string t; read(t); d = stod(t); }
void read(long double& d) { string t; read(t); d = stold(t); }
template<class H, class... T> void read(H& h, T&... t) { read(h); read(t...); }
template<class A> void read(vt<A>& x) { for (auto& a : x) read(a); }
template<class A, size_t S> void read(array<A, S>& x) { for (auto& a : x) read(a); }

string to_string(char c) { return string(1, c); }
string to_string(bool b) { return b ? "true" : "false"; }
string to_string(const char* s) { return string(s); }
string to_string(string s) { return s; }
string to_string(vt<bool> v) { string res; for (int i = 0; i < sz(v); ++i) res += char('0' + v[i]); return res; }
template<size_t S> string to_string(bitset<S> b) { string res; for (int i = 0; i < S; ++i) res += char('0' + b[i]); return res; }
template<class T> string to_string(T v) { bool f = 1; string res; for (auto x : v) { if (!f) res += ' '; f = 0; res += to_string(x); } return res; }

template<class A> void write(A x) { cout << to_string(x); }
template<class H, class... T> void write(const H& h, const T&... t) { write(h); write(t...); }

void print() { write("\n"); }
template<class H, class... T> void print(const H& h, const T&... t) { write(h); if (sizeof...(t)) write(' '); print(t...); }

void freop(string s) {
  freopen((s + ".in").c_str(), "r", stdin);
  freopen((s + ".out").c_str(), "w", stdout);
}

const int MOD = 1e9 + 7;
const ll INF = 1e14;
const int M = 4e5 + 5;
const double long pi = acos(-1);
const double long eps = 1e-12;
const int sq = 700;

int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};
/* ll vs int*/

const int N = 1e6 + 5;

pr<int, int> col[5];
vt<int> ans;
vt<vt<int>> g, g1;
int n, m;
int raz[N], fup[N], tin[N], timer, par[N];
void dfs(int v, int p = -1) {
  raz[v] = 1;
  tin[v] = fup[v] = ++timer;
  par[v] = p;
  for(auto to : g[v]) {
    if(to == p) continue;
    if(!raz[to]) {
      dfs(to, v);
      fup[v] = min(fup[v], fup[to]);
      raz[v] += raz[to];
      g1[v].pb(to);
    }
    else fup[v] = min(fup[v], tin[to]);
  }
}
int best, ost = MOD;
void dfs1(int v, int p = -1) {
  if(raz[v] >= col[0].ff) {
    if(ost > raz[v] - col[0].ff) {
      ost = raz[v] - col[0].ff;
      best = v;
    }
  }
  for(auto to : g1[v]) {
    if(to == p) continue;
    dfs1(to, v);
  }
}

int curcolor, cur;
void color(int v, bool ok) {
  if(!cur) return;
  //print(v);
  if(ans[v] == 0) {
    cur--;
    ans[v] = curcolor;
  }
  if(ok) {
    for(auto to : g1[v]) {
      if(cur) color(to, ok);
    }
  }
  else {
    for(auto to : g[v]) {
      if(ans[to] != col[0].ss && ans[to] != col[1].ss) {
        color(to, ok);
      }
    }
  }
}
vt<int> find_split(int xN, int xA, int xB, int xC, vt<int> p, vt<int> q) {
  n = xN;
  m = sz(q);
  col[0] = {xA, 1};
  col[1] = {xB, 2};
  col[2] = {xC, 3};
  ans.resize(n);
  sort(col, col + 3);
  g.resize(n);
  g1.resize(n);
  for(int i = 0; i < m; ++i) {
    g[p[i]].pb(q[i]);
    g[q[i]].pb(p[i]);
  }
  dfs(0);
 /* for(int i = 0; i < n; ++i) {
    for(auto num : g1[i]) print(i, num);
  }*/
  dfs1(0);
  if(n - raz[best] >= col[1].ff) {
    curcolor = col[0].ss, cur = col[0].ff;
    //print(best, cur, curcolor);
    color(best, 1);
    curcolor = col[1].ss, cur = col[1].ff;
   // print(par[best], cur, curcolor);
    color(par[best], 0);
    for(auto &num : ans) {
      if(num == 0) num = col[2].ss;
    }
    return ans;
  }
  else {
    curcolor = col[1].ss, cur = col[1].ff;
    ans[best] = curcolor;
    cur--;
    for(auto to : g1[best]) {
      if(cur && fup[to] > tin[best]) {
        color(best, 1);
      }
    }

    for(auto to : g1[best]) {
      if(cur && fup[to] <= tin[best]) {
        color(best, 1);
      }
    }

    curcolor = col[0].ss, cur = col[0].ff;
    if(par[best] != -1) color(par[best], 0);
    for(auto &num : ans) {
      if(cur) num = 0;
      else {
        if(num == 0) num = col[2].ss;
      }
    }
  }
  return ans;
}
/*
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  //freop("");
  int t = 1;
  //read(t);
  for (int i = 1; i <= t; ++i) {
    //write("Case #" + to_string(i) + ": ");
    solve();
  }
  return 0;
}*/

Compilation message (stderr)

split.cpp: In function 'void freop(std::string)':
split.cpp:64:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
split.cpp:65:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |   freopen((s + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 24 / 24
• Subtask 5: 36 / 36