Submission #204157

#	Time	Username	Problem	Language	Result	Execution time	Memory
204157		cheetose	Meetings (JOI19_meetings)	C++17	100 / 100	847 ms	1016 KiB

meetings

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define y0 y12
#define y1 y22
#define INF 987654321
#define PI 3.141592653589793238462643383279502884
#define fup(i, a, b, c) for (int(i) = (a); (i) <= (b); (i) += (c))
#define fdn(i, a, b, c) for (int(i) = (a); (i) >= (b); (i) -= (c))
#define MEM0(a) memset((a), 0, sizeof(a));
#define MEM_1(a) memset((a), -1, sizeof(a));
#define ALL(a) a.begin(), a.end()
#define SYNC                          \
    ios_base::sync_with_stdio(false); \
    cin.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<ld, ld> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<ld> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const int MOD = 1000000007;
ll POW(ll a, ll b, ll MMM = MOD) {
    ll ret = 1;
    for (; b; b >>= 1, a = (a * a) % MMM)
        if (b & 1)
            ret = (ret * a) % MMM;
    return ret;
}
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) {
    if (a == 0 || b == 0)
        return a + b;
    return a * (b / gcd(a, b));
}
int dx[] = { 0, 1, 0, -1, 1, 1, -1, -1 }, dy[] = { 1, 0, -1, 0, 1, -1, 1, -1 };
int ddx[] = { -1, -2, 1, -2, 2, -1, 2, 1 }, ddy[] = { -2, -1, -2, 1, -1, 2, 1, 2 };

#include "meetings.h"
#define kill kool
Vi v[2005];
void discon(int x, int y) {
    for (int &z : v[x]) {
        if (z == y) {
            z = v[x].back();
            v[x].back() = y;
            break;
        }
    }
    for (int &z : v[y]) {
        if (z == x) {
            z = v[y].back();
            v[y].back() = x;
            break;
        }
    }
    v[x].pop_back();
    v[y].pop_back();
}
void con(int x, int y) {
    v[x].pb(y);
    v[y].pb(x);
}

bool chk[2005], kill[2005];
int sz[2005];
int getSz(int N, int pp) {
    sz[N] = 1;
    for (int next : v[N]) {
        if (next == pp || kill[next])
            continue;
        sz[N] += getSz(next, N);
    }
    return sz[N];
}
int get_centroid(int N, int pp, int cap) {
    for (int next : v[N]) {
        if (kill[next] || next == pp)
            continue;
        if (sz[next] > cap)
            return get_centroid(next, N, cap);
    }
    return N;
}
void Solve(int N) {
    chk[0] = chk[1] = chk[2] = 1;
    int w = Query(0, 1, 2);
    if (w > 2) {
        chk[w] = 1;
        con(0, w);
        con(1, w);
        con(2, w);
    } else {
        fup(i, 0, 2, 1) if (w != i) con(i, w);
    }
    fup(i, 3, N - 1, 1) {
        MEM0(kill);
        if (chk[i])
            continue;
        chk[i] = 1;
        int pr = 0;
        while (1) {
            int cap = getSz(pr, -1);
            int R = get_centroid(pr, -1, cap / 2);
            getSz(R, -1);
            sort(ALL(v[R]), [&](int a, int b) { return sz[a] > sz[b]; });
            kill[R] = 1;
            int t = -1;
            fup(j, 1, (int)v[R].size() - 1, 2) {
                int a = v[R][j - 1], b = v[R][j];
                int x = Query(a, i, b);
                if (x == i) {
                    int T = Query(R, i, a);
                    if (T == i) {
                        discon(R, a);
                        con(R, i);
                        con(i, a);
                    } else {
                        discon(R, b);
                        con(R, i);
                        con(i, b);
                    }
                    goto FIN;
                } else if (x != R) {
                    t = x;
                    break;
                }
            }
            if (t == -1 && v[R].size() & 1) {
                int x = Query(R, i, v[R].back());
                if (x == i) {
                    int B = v[R].back();
                    discon(R, B);
                    con(R, i);
                    con(i, B);
                    goto FIN;
                } else if (x != R)
                    t = x;
            }
            if (t == -1) {
                con(R, i);
                goto FIN;
            } else {
                pr = t;
            }
        }
    FIN:;
    }
    fup(i, 0, N - 1, 1) {
        for (int x : v[i]) {
            if (x > i)
                Bridge(i, x);
        }
    }
}

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 71 / 71