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답안 #952824

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
952824 2024-03-25T01:39:29 Z gaga999 Mountains and Valleys (CCO20_day1problem3) C++17
3 / 25
 27 ms 89176 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 int long long
#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], th[N], dp[N], ans;
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(th[u], mx[v] + 1);
        if (th[u] > sc[u])
            swap(th[u], sc[u]);
        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];
}

inline int jp(int a, int u)
{
    for (int i = 19; i >= 0; i--)
        if (ac[i][u] && !isa(ac[i][u], a))
            u = ac[i][u];
    return 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, 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, 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]);
        // db(dp[p], p, u, xr[i], yr[i], ans);
        vv.ini(), qy(1, ct, 1, dp[p] + 1, dp[u]);
        tmin(ans, wr[i] - (vv.ans + dp[xr[i]] + dp[yr[i]] - (dp[p] << 1)));
        if (xr[i] == u)
            a1[i] = vv.vn;
        else
            tmin(ans, wr[i] - (vv.vn + a1[i] + dp[xr[i]] + dp[yr[i]]));
        int tp = dp[xr[i]] + dp[yr[i]] + vv.vn;
        int v1 = mx[jp(p, xr[i])] + 1, v2 = mx[jp(p, yr[i])] + 1;
        if (v1 < v2)
            swap(v1, v2);
        if (v1 != mx[p])
            tmin(ans, wr[i] - (tp - dp[p] + mx[p]));
        else if (v2 != sc[p])
            tmin(ans, wr[i] - (tp - dp[p] + sc[p]));
        else
            tmin(ans, wr[i] - (tp - dp[p] + th[p]));
        if (ac[0][p])
        {
            vv.ini(), qy(1, ct, 1, 1, dp[p] - 1);
            tmin(ans, wr[i] - (tp + vv.vn));
        }
    }
}

signed main()
{
    int n, m;
    rd(n, m);
    // assert(n == 6);
    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]);
    }
    int rt = 1;
    dp[rt] = 1, dfs(rt, -1), ans = ((n - 1) << 1) - ans;
    int pans = ans;
    for (int i = 0; i < m; i++)
    {
        assert(xr[i] != yr[i]);
        if (wr[i] == 1)
            continue;
        wr[i] += (n - 2) << 1;
        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(rt, -1);
    assert(ans <= pans);
    prt(ans), putchar('\n');
}

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct

Subtask #2
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 87132 KB Output is correct
2 Correct 22 ms 87132 KB Output is correct
3 Correct 24 ms 88924 KB Output is correct
4 Correct 27 ms 86876 KB Output is correct
5 Correct 24 ms 88920 KB Output is correct
6 Correct 22 ms 88864 KB Output is correct
7 Correct 23 ms 89176 KB Output is correct
8 Correct 23 ms 86916 KB Output is correct
9 Correct 24 ms 87132 KB Output is correct
10 Correct 23 ms 86876 KB Output is correct
11 Correct 23 ms 86872 KB Output is correct
12 Correct 23 ms 88668 KB Output is correct
13 Correct 24 ms 86876 KB Output is correct
14 Correct 24 ms 89032 KB Output is correct

Subtask #4
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 85084 KB Output is correct
2 Correct 16 ms 87132 KB Output is correct
3 Correct 16 ms 85084 KB Output is correct
4 Correct 18 ms 85084 KB Output is correct
5 Correct 17 ms 87132 KB Output is correct
6 Correct 16 ms 87128 KB Output is correct
7 Correct 16 ms 87132 KB Output is correct
8 Correct 16 ms 87168 KB Output is correct
9 Correct 17 ms 85080 KB Output is correct
10 Correct 18 ms 87388 KB Output is correct
11 Correct 16 ms 85080 KB Output is correct
12 Correct 17 ms 87132 KB Output is correct
13 Correct 16 ms 85080 KB Output is correct
14 Correct 15 ms 85112 KB Output is correct
15 Correct 17 ms 87132 KB Output is correct
16 Correct 16 ms 85080 KB Output is correct
17 Correct 16 ms 87152 KB Output is correct
18 Incorrect 16 ms 87164 KB Output isn't correct
19 Halted 0 ms 0 KB -