oj.uz

Submission #952725

# Submission time Handle Problem Language Result Execution time Memory
952725 2024-03-24T16:16:33 Z gaga999 Mountains and Valleys (CCO20_day1problem3) C++17
2 / 25
 34 ms 111552 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

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 111452 KB Output is correct
2 Correct 26 ms 111440 KB Output is correct
3 Correct 25 ms 111272 KB Output is correct
4 Correct 26 ms 111196 KB Output is correct
5 Correct 25 ms 111196 KB Output is correct
6 Correct 23 ms 111056 KB Output is correct
7 Correct 30 ms 111452 KB Output is correct
8 Correct 26 ms 111428 KB Output is correct
9 Correct 24 ms 111552 KB Output is correct
10 Correct 25 ms 111184 KB Output is correct
11 Correct 24 ms 111452 KB Output is correct
12 Correct 25 ms 111196 KB Output is correct
13 Correct 25 ms 111188 KB Output is correct
14 Correct 25 ms 111312 KB Output is correct

Subtask #4
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 106332 KB Output is correct
2 Correct 19 ms 110684 KB Output is correct
3 Correct 17 ms 61392 KB Output is correct
4 Correct 26 ms 59228 KB Output is correct
5 Correct 26 ms 59228 KB Output is correct
6 Correct 19 ms 110504 KB Output is correct
7 Correct 27 ms 59220 KB Output is correct
8 Correct 26 ms 59228 KB Output is correct
9 Correct 20 ms 110936 KB Output is correct
10 Correct 20 ms 108380 KB Output is correct
11 Incorrect 19 ms 110684 KB Output isn't correct
12 Halted 0 ms 0 KB -