Submission #420484

#	Time	Username	Problem	Language	Result	Execution time	Memory
420484		yuto1115	Split the Attractions (IOI19_split)	C++17	0 / 100	782 ms	1048580 KiB

split

#include "split.h"
#include <bits/stdc++.h>
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define rep2(i, s, n) for(ll i = ll(s); i < ll(n); i++)
#define rrep(i, n) for(ll i = ll(n)-1; i >= 0; i--)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define pb push_back
#define eb emplace_back
using namespace std;
using ll = long long;
using P = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vp = vector<P>;
using vvp = vector<vp>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;

template<class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

const int inf = 1001001001;
const ll linf = 1001001001001001001;

vi find_split(int n, int a, int b, int c, vi p, vi q) {
    vvi G(n);
    rep(i, p.size()) {
        G[p[i]].pb(q[i]);
        G[q[i]].pb(p[i]);
    }
    vi ord = {1, 2, 3};
    rep(_, 2) {
        rep(__, 3) {
            vi ls;
            vi in(n), out(n);
            P dif(0, 0);
            P same(0, 0);
            auto dfs = [&](auto &dfs, int u, int p) -> P {
                in[u] = ls.size();
                ls.pb(u);
                P res(0, 0);
                for (int v : G[u]) {
                    if (v == p) continue;
                    P now = dfs(dfs, v, u);
                    if (now.first and res.second) {
                        dif = {now.first, res.second};
                    }
                    if (now.second and res.first) {
                        dif = {res.first, now.second};
                    }
                    if(now.first) res.first = now.first;
                    if(now.second) res.second = now.second;
                }
                out[u] = ls.size();
                if (out[u] - in[u] == b) res.first = u + 1;
                if (out[u] - in[u] == c) res.second = u + 1;
                if (out[u] - in[u] == b + c) {
                    if (res.second) {
                        same = {u + 1, res.second};
                    }
                }
                return res;
            };
            dfs(dfs, 0, -1);
            if (dif.first) {
                dif.first--, dif.second--;
                vi ans(n);
                rep2(i, in[dif.first], out[dif.first]) ans[ls[i]] = ord[1];
                rep2(i, in[dif.second], out[dif.second]) ans[ls[i]] = ord[2];
                rep(i, n) if (!ans[i]) ans[i] = ord[0];
                return ans;
            }
            if (same.first) {
                same.first--, same.second--;
                vi ans(n);
                rep2(i, in[same.second], out[dif.second]) ans[ls[i]] = ord[2];
                rep2(i, in[same.first], out[same.first]) if (!ans[ls[i]]) ans[ls[i]] = ord[1];
                rep(i, n) if (!ans[i]) ans[i] = ord[0];
                return ans;
            }
            swap(a, b);
            swap(ord[0], ord[1]);
            swap(b, c);
            swap(ord[1], ord[2]);
        }
        swap(a, b);
        swap(ord[0], ord[1]);
    }
    return vi(n, 0);
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36