Submission #1060604

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060604		ewirlan	Highway Tolls (IOI18_highway)	C++17	51 / 100	166 ms	11784 KiB

highway

//
#ifndef __SIZEOF_INT128__
  #define __SIZEOF_INT128__
#endif
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "highway.h"
using namespace std;
using namespace chrono;
using namespace __gnu_pbds;
template <typename T> using oset =  tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define rep(i, p, k) for(int i(p); i < (k); ++i)
#define per(i, p, k) for(int i(p); i > (k); --i)
#define sz(x) (int)(x).size()
#define sc static_cast
typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef __int128_t lll;
//#define int ll
template <typename T = int> using par = std::pair <T, T>;
#define fi first
#define se second
#define test int _number_of_tests(in()); while(_number_of_tests--)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb emplace_back
struct Timer {
    string name{""};
    time_point<high_resolution_clock> end, start{high_resolution_clock::now()};
    duration<float, std::milli> dur;
    Timer() = default;
    Timer(string nm): name(nm) {}
    ~Timer() {
        end = high_resolution_clock::now(); dur= end - start;
        cout << "@" << name << "> " << dur.count() << " ms" << '\n';
    }
};
template <typename T = int> inline T in()
{
    static T x;
    std::cin >> x;
    return x;
}
std::string yn(bool b)
{
    if(b) return "YES\n";
    else return "NO\n";
}
template <typename F, typename S> std::ostream& operator<<(std::ostream& out, const std::pair <F, S>& par);
template <typename T> std::ostream& operator<< (std::ostream& out, const std::vector <T>& wek)
{
    for(const auto& i : wek)out << i << ' ';
    return out;
}
template <typename F, typename S> std::ostream& operator<<(std::ostream& out, const std::pair <F, S>& par)
{
    out << '{'<<par.first<<", "<<par.second<<"}";
    return out;
}
#define show(x) cerr << #x << " = " << x << '\n';
constexpr int maxn = 90003;
vector <pair<int, int>> graf[maxn];
int odl[maxn];
bool xd[maxn];
void dfs(int w, bool x)
{
    odl[w] = 1;
    xd[w] = x;
    for(auto [i, j]: graf[w])if(!odl[i])dfs(i, !x);
}
void find_pair(int n, vector <int> ka, vector <int> kb, int a, int b)
{
    int m(sz(ka));
    rep(i, 0, m){
        graf[ka[i]].pb(kb[i], i);
        graf[kb[i]].pb(ka[i], i);
    }
    dfs(0, 0);
    vector <int> xdd[2];
    rep(i, 0, n)xdd[xd[i]].pb(i);
    vector vv = xdd[sz(xdd[1]) < sz(xdd[0])];
    ll d(ask(vector<int>(m, 0))/a);
    auto pyt = [n,m](vector <bool> v){
        vector <int> w(m);
        rep(i, 0, n)if(v[i])for(auto [i, j]: graf[i])w[j] |= 1;
        return ask(w);
    };
    int p(0), k(sz(vv)), s;
    vector <bool> v(n);
    while(k > p){
        s = (p+k)/2;
        rep(i, 0, n)v[i] = 0;
        rep(i, 0, sz(vv))v[vv[i]] = i >= s;
        if(pyt(v) == d*a)k = s;
        else p = s+1;
    }
    int r(p-1);
    vector <int> so;
    queue <int> kul; 
    bool je(0);
rp:
    rep(i, 0, n)odl[i] = 0;
    so = {r};
    kul.push(r);
    odl[r] = 1;
    while(kul.size()){
        auto t(kul.front()); kul.pop();
        for(auto [i, j]: graf[t])if(!odl[i]){
            kul.push(i);
            so.pb(i);
            odl[i] = odl[t]+1;
        }
    }
    if(je){
        vector <int> s;
        for(auto i: so)if(odl[i] == d+1)s.pb(i);
        so = s;
    }
    p = 0, k = sz(so);
    while(k > p){
        s = (p+k)/2;
        rep(i, 0, n)v[i] = 0;
        rep(i, 0, sz(so))v[so[i]] = i >= s;
        if(pyt(v) == d*a)k = s;
        else p = s+1;
    }
    if(!je){
        r = so[p-1];
        je = 1;
        goto rp;
    }
    answer(r, so[p-1]);
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 6 / 6
• Subtask 4: 33 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31