Submission #966478

#	Time	Username	Problem	Language	Result	Execution time	Memory
966478		gaga999	Swapping Cities (APIO20_swap)	C++17	0 / 100	101 ms	34816 KiB

swap

// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx,avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#define lowbit(x) ((x) & -(x))
#define ml(a, b) ((1ll * (a) * (b)) % M)
#define tml(a, b) (a) = ((1ll * (a) * (b)) % M)
#define ad(a, b) ((0ll + (a) + (b)) % M)
#define tad(a, b) (a) = ((0ll + (a) + (b)) % M)
#define mi(a, b) ((0ll + M + (a) - (b)) % M)
#define tmi(a, b) (a) = ((0ll + M + (a) - (b)) % M)
#define tmin(a, b) (a) = min((a), (b))
#define tmax(a, b) (a) = max((a), (b))
#define iter(a) (a).begin(), (a).end()
#define riter(a) (a).rbegin(), (a).rend()
#define inin(a, b) memset((a), (b), sizeof(a))
#define cpy(a, b) memcpy((a), (b), sizeof(a))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define size(x) (int)x.size()
#define pb emplace_back
#define mpr make_pair
#define ls(i) ((i) << 1)
#define rs(i) ((i) << 1 | 1)
#define INF 0x3f3f3f3f
#define NIF 0xc0c0c0c0
#define eps 1e-9
#define F first
#define S second
#define AC cin.tie(0)->sync_with_stdio(0)
using namespace std;
typedef long long llt;
typedef __int128_t lll;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<llt, llt> pll;
typedef complex<double> cd;
// const int M = 998244353;

// random_device rm;
// mt19937 rg(rm());
// default_random_engine rg(rm());
// uniform_int_distribution<int> rd(INT_MIN, INT_MAX);
// uniform_real_distribution<double> rd(0, M_PI);

void db() { cerr << "\n"; }
template <class T, class... U>
void db(T a, U... b) { cerr << a << " ", db(b...); }

inline char gc()
{
    const static int SZ = 1 << 16;
    static char buf[SZ], *p1, *p2;
    if (p1 == p2 && (p2 = buf + fread(p1 = buf, 1, SZ, stdin), p1 == p2))
        return -1;
    return *p1++;
}
void rd() {}
template <typename T, typename... U>
void rd(T &x, U &...y)
{
    x = 0;
    bool f = 0;
    char c = gc();
    while (!isdigit(c))
        f ^= !(c ^ 45), c = gc();
    while (isdigit(c))
        x = (x << 1) + (x << 3) + (c ^ 48), c = gc();
    f && (x = -x), rd(y...);
}

template <typename T>
void prt(T x)
{
    if (x < 0)
        putchar('-'), x = -x;
    if (x > 9)
        prt(x / 10);
    putchar((x % 10) ^ 48);
}

const int N = 2e5 + 5;
int ds[N], vl[N], ac[20][N], in[N], ou[N], ctt, n, m, ct;
bool ok[N];
vector<int> pt[N], eg[N];

int f(int x)
{
    return ds[x] < 0 ? x : ds[x] = f(ds[x]);
}

inline void mg(int i, int j)
{
    i = f(i), j = f(j);
    if (i != j)
    {
        if (size(pt[i]) < size(pt[j]))
            swap(i, j);
        for (int p : pt[j])
            pt[i].pb(p);
        ds[i] += ds[j], ds[j] = i;
    }
}

void dfs(int u)
{
    in[u] = ++ctt;
    for (int v : eg[u])
    {
        ac[0][v] = u;
        for (int i = 1; i < 20; i++)
            ac[i][v] = ac[i - 1][ac[i - 1][v]];
        dfs(v);
    }
    ou[u] = ctt;
}

inline bool isa(int a, int p)
{
    return in[a] <= in[p] && ou[p] <= ou[a];
}

int lca(int u, int v)
{
    if (f(u) != f(v) || !ok[f(v)])
        return -1;
    if (isa(u, v))
        return vl[u]; // assert(0)
    for (int i = 19; i >= 0; i--)
        if (ac[i][u] && !isa(ac[i][u], v))
            u = ac[i][u];
    return vl[ac[0][u]];
}

void init(int _n, int _m, vector<int> U, vector<int> V, vector<int> W)
{
    n = ct = _n, m = _m, inin(ds, -1);
    for (int i = 1; i <= n; i++)
        pt[i].pb(i);
    vector<int> od(m);
    iota(iter(od), 0);
    sort(iter(od), [&](int a, int b)
         { return W[a] < W[b]; });
    for (int i : od)
    {
        U[i] = f(U[i]), V[i] = f(V[i]);
        if (U[i] == V[i])
        {
            if (ok[U[i]])
                continue;
            vl[++ct] = W[i];
            for (int v : pt[V[i]])
                eg[ct].pb(v);
            pt[V[i]].clear();
            pt[ct].pb(ct);
            mg(ct, U[i]);
            ok[f(ct)] = 1;
        }
        else
        {
            if (ok[U[i]] || ok[V[i]])
            {
                vl[++ct] = W[i];
                for (int v : pt[V[i]])
                    eg[ct].pb(v);
                pt[V[i]].clear();
                for (int v : pt[U[i]])
                    eg[ct].pb(v);
                pt[U[i]].clear();
                pt[ct].pb(ct);
                mg(ct, U[i]), mg(ct, V[i]);
                ok[f(ct)] = 1;
            }
            else
                mg(U[i], V[i]);
        }
    }
    for (int i = n + 1; i <= ct; i++)
        if (!pt[i].empty())
            dfs(i);
}

int getMinimumFuelCapacity(int X, int Y)
{
    return lca(X, Y);
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27