oj.uz

답안 #952723

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
952723 2024-03-24T16:16:11 Z gaga999 Mountains and Valleys (CCO20_day1problem3) C++17
2 / 25
 28 ms 109452 KB 
// #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 init(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 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 = 5e5 + 5, M = 2e6 + 6;
vector<int> eg[N];
int xr[M], yr[M], wr[M], a1[M];
int in[N], ou[N], ct, ac[20][N];
int mx[N], sc[N], dp[N], ans, bs;
vector<int> q1[N], q2[N];

void dfs(int u, int fa)
{
    in[u] = ++ct;
    for (int v : eg[u])
    {
        if (v == fa)
            continue;
        ac[0][v] = u, dp[v] = dp[u] + 1;
        for (int i = 1; i < 20; i++)
            ac[i][v] = ac[i - 1][ac[i - 1][v]];
        dfs(v, u);
        tmax(sc[u], mx[v] + 1);
        if (sc[u] > mx[u])
            swap(mx[u], sc[u]);
    }
    tmax(ans, mx[u] + sc[u]), ou[u] = ct;
}

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

inline int lca(int u, int v)
{
    if (isa(u, v))
        return u;
    for (int i = 19; i >= 0; i--)
        if (ac[i][u] && !isa(ac[i][u], v))
            u = ac[i][u];
    return ac[0][u];
}

struct P
{
    int vp, vn, ans;
    P() { vp = vn = ans = -INF; }
    inline void ini() { vp = vn = ans = -INF; }
    P operator+(const P &rh)
    {
        P res;
        res.ans = max({ans, vp + rh.vn, rh.ans});
        res.vp = max(vp, rh.vp);
        res.vn = max(vn, rh.vn);
        return res;
    }
} tr[N << 2], vv;

void cg(int l, int r, int id, int p, int v)
{
    if (l == r)
    {
        tr[id].vp = v + p;
        tr[id].vn = v - p;
        tr[id].ans = -INF;
        return;
    }
    int m = (l + r) >> 1;
    if (p <= m)
        cg(l, m, ls(id), p, v);
    else
        cg(m + 1, r, rs(id), p, v);
    tr[id] = tr[ls(id)] + tr[rs(id)];
}

void qy(int l, int r, int id, int ql, int qr)
{
    if (ql <= l && r <= qr)
    {
        vv = vv + tr[id];
        return;
    }
    int m = (l + r) >> 1;
    if (ql <= m)
        qy(l, m, ls(id), ql, qr);
    if (qr > m)
        qy(m + 1, r, rs(id), ql, qr);
}

void slv(int u, int fa)
{
    for (int v : eg[u])
    {
        if (v == fa)
            continue;
        cg(1, ct, 1, dp[u], mx[v] + 1 == mx[u] ? sc[u] : mx[u]);
        slv(v, u);
    }
    cg(1, ct, 1, dp[u], mx[u]);
    for (int i : q1[u])
    {
        vv.ini(), qy(1, ct, 1, dp[xr[i]], dp[u]);
        // tmin(ans, bs + wr[i] - (vv.ans + dp[u] - dp[xr[i]]));
        vv.ini(), qy(1, ct, 1, dp[xr[i]] + 1, dp[u]);
        int tp = vv.vn + dp[u] + dp[xr[i]];
        vv.ini(), qy(1, ct, 1, 1, dp[xr[i]]);
        // tmin(ans, bs + wr[i] - (tp + vv.vn));
    }
    for (int i : q2[u])
    {
        int p = lca(xr[i], yr[i]);
        vv.ini(), qy(1, ct, 1, dp[p], dp[u]);
        // tmin(ans, bs + wr[i] -
        //               (vv.ans + dp[xr[i]] + dp[yr[i]] - (dp[p] << 1)));
        vv.ini(), qy(1, ct, 1, dp[p] + 1, dp[u]);
        // if (xr[i] == u)
        //     a1[i] = vv.vn;
        // else
        //     tmin(ans, bs + wr[i] - (vv.vn + a1[i] + dp[xr[i]] + dp[yr[i]]));
    }
}

signed main()
{
    int n, m;
    rd(n, m), bs = (n - 2) << 1;
    for (int i = 0; i < m; i++)
    {
        rd(xr[i], yr[i], wr[i]), xr[i]++, yr[i]++;
        if (wr[i] == 1)
            eg[xr[i]].pb(yr[i]), eg[yr[i]].pb(xr[i]);
    }
    dp[1] = 1, dfs(1, -1), ans = ((n - 1) << 1) - ans;
    for (int i = 0; i < m; i++)
    {
        assert(xr[i] != yr[i]);
        if (wr[i] == 1)
            continue;
        if (in[xr[i]] > in[yr[i]])
            swap(xr[i], yr[i]);
        if (isa(xr[i], yr[i]))
            q1[yr[i]].pb(i);
        else
            q2[xr[i]].pb(i), q2[yr[i]].pb(i);
    }
    slv(1, -1);
    prt(ans), putchar('\n');
}

Compilation message

Main.cpp: In function 'void slv(int, int)':
Main.cpp:181:13: warning: unused variable 'tp' [-Wunused-variable]
  181 |         int tp = vv.vn + dp[u] + dp[xr[i]];
      |             ^~

Subtask #1
0.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 109148 KB Output is correct
2 Correct 28 ms 109272 KB Output is correct
3 Correct 27 ms 109144 KB Output is correct
4 Correct 25 ms 109152 KB Output is correct
5 Correct 25 ms 109148 KB Output is correct
6 Correct 23 ms 109152 KB Output is correct
7 Correct 25 ms 109204 KB Output is correct
8 Correct 25 ms 109260 KB Output is correct
9 Correct 25 ms 109400 KB Output is correct
10 Correct 25 ms 109260 KB Output is correct
11 Correct 25 ms 109264 KB Output is correct
12 Correct 25 ms 109148 KB Output is correct
13 Correct 25 ms 109452 KB Output is correct
14 Correct 25 ms 109148 KB Output is correct

Subtask #4
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 108384 KB Output is correct
2 Correct 19 ms 108636 KB Output is correct
3 Correct 18 ms 108636 KB Output is correct
4 Correct 19 ms 108636 KB Output is correct
5 Correct 19 ms 108632 KB Output is correct
6 Correct 19 ms 108632 KB Output is correct
7 Correct 20 ms 108376 KB Output is correct
8 Correct 18 ms 108376 KB Output is correct
9 Correct 20 ms 108636 KB Output is correct
10 Correct 19 ms 108636 KB Output is correct
11 Incorrect 19 ms 108640 KB Output isn't correct
12 Halted 0 ms 0 KB -