Submission #906970

#	Time	Username	Problem	Language	Result	Execution time	Memory
906970		CDuong	Two Currencies (JOI23_currencies)	C++17	0 / 100	7 ms	25692 KiB

currencies

/*
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,fma,bmi,bmi2,sse4.2,popcnt,lzcnt")
*/

#include <bits/stdc++.h>
#define taskname ""
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define i64 long long
#define pb push_back
#define ff first
#define ss second
#define isz(x) (int)x.size()
using namespace std;

const int mxN = 1e5 + 5;
const int mod = 1e9 + 7;
const int LOG = 20;
const i64 oo = 1e18;

void adds(pair<i64, int> &val, pair<i64, int> nval) {
    val.ff += nval.ff;
    val.ss += nval.ss;
}

struct FenwickTree {
    int n;
    vector<pair<i64, int>> data;

    FenwickTree() {};
    FenwickTree(int n) : n(n), data(4 * n + 10) {}

    void update(int idx, pair<i64, int> val) {
        while (idx <= n) {
            adds(data[idx], val);
            idx += idx & -idx;
        }
    }

    pair<i64, int> get(int idx) {
        pair<i64, int> res = {0, 0};
        while (idx) {
            adds(res, data[idx]);
            idx -= idx & -idx;
        }
        return res;
    }
} fenw;

struct Checkpoint {
    int p, c;
    Checkpoint(int p, int c) : p(p), c(c) {}
    bool operator < (const Checkpoint &cp) const {
        return c < cp.c;
    }
};

struct Query {
    int s, t, x, y;
    Query(int s, int t, int x, int y) : s(s), t(t), x(x), y(y) {}
};

int n, m, q, ans[mxN];
vector<Query> qq;
vector<Checkpoint> cp;
pair<int, int> edges[mxN];
vector<pair<int, int>> G[mxN];
int tin[mxN], tout[mxN], ap[mxN], par[mxN], dep[mxN], cnt_edges[mxN], h[mxN], tdfs, ecnt;
pair<int, int> euler[LOG][2 * mxN];
int ptr_pbs = -1;

void dfs(int v, int p) {
    tin[v] = ++tdfs;
    dep[v] = dep[p] + 1;
    par[v] = p;
    euler[0][++ecnt] = {dep[v], v};
    ap[v] = ecnt;
    for (auto [u, eidx] : G[v]) if (u != p) {
        h[u] = h[v] + cnt_edges[eidx];
        dfs(u, v);
        euler[0][++ecnt] = {dep[v], v};
    }
    tout[v] = tdfs;
}

void build_euler() {
    for (int i = 1, p = 1; (p << 1) <= ecnt; ++i, p <<= 1) {
        for (int j = 1; j + (p << 1) - 1 <= ecnt; ++j) {
            euler[i][j] = min(euler[i - 1][j], euler[i - 1][j + p]);
        }
    }
}

int LCA(int u, int v) {
    int l = ap[u], r = ap[v];
    if (l > r) swap(l, r);
    int len = r - l + 1, lg_len = 31 - __builtin_clz(len);
    return min(euler[lg_len][l], euler[lg_len][r - (1 << lg_len) + 1]).ss;
}

void add(int cpidx) {
    auto [p, c] = cp[cpidx];
    auto [u, v] = edges[p];
    if (dep[u] < dep[v]) swap(u, v);
    fenw.update(tin[u], {c, 1});
    fenw.update(tout[u] + 1, {-c, -1});
}

void del(int cpidx) {
    auto [p, c] = cp[cpidx];
    auto [u, v] = edges[p];
    if (dep[u] < dep[v]) swap(u, v);
    fenw.update(tin[u], {-c, -1});
    fenw.update(tout[u] + 1, {c, 1});
}

void pbs(int l, int r, vector<int> &qq_idx) {
    // cout << l << " " << r << endl;
    if (l > r or qq_idx.empty()) return;

    int mid = (l + r) >> 1;
    // cout << mid << endl;
    while (ptr_pbs < mid) add(++ptr_pbs);
    while (ptr_pbs > mid) del(ptr_pbs--);

    vector<int> qql, qqr;

    for (int idx : qq_idx) {
        auto [s, t, x, y] = qq[idx];
        int lca = LCA(s, t);

        pair<i64, int> total_silver = {0, 0};
        adds(total_silver, fenw.get(tin[s]));
        adds(total_silver, fenw.get(tin[t]));
        auto cur = fenw.get(tin[lca]); cur.ff *= -2, cur.ss *= -2;
        adds(total_silver, cur);

        if (total_silver.ff <= x) {
            ans[idx] = max(ans[idx], y - (h[s] + h[t] - 2 * h[lca] - total_silver.ss));
            qqr.emplace_back(idx);
        }
        else {
            qql.emplace_back(idx);
        }
    }

    pbs(l, mid - 1, qql);
    pbs(mid + 1, r, qqr);
}

void solve() {
    cin >> n >> m >> q;
    fenw = FenwickTree(n);
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        G[u].emplace_back(v, i);
        G[v].emplace_back(u, i);
        edges[i] = {u, v};
    }
    for (int i = 1; i <= m; ++i) {
        int p, c;
        cin >> p >> c;
        cp.emplace_back(p, c);
        cnt_edges[p]++;
    }
    sort(all(cp));
    for (int i = 1; i <= q; ++i) {
        int s, t, x, y;
        cin >> s >> t >> y >> x;
        qq.emplace_back(s, t, x, y);
        ans[i - 1] = -1;
    }
    dfs(1, 0);
    build_euler();
    vector<int> qq_idx(q); iota(all(qq_idx), 0);
    pbs(-1, m - 1, qq_idx);
    for (int i = 0; i < q; ++i)
        cout << ans[i] << "\n";
}

signed main() {

#ifndef CDuongg
    if(fopen(taskname".inp", "r"))
        assert(freopen(taskname".inp", "r", stdin)), assert(freopen(taskname".out", "w", stdout));
#else
    freopen("bai3.inp", "r", stdin);
    freopen("bai3.out", "w", stdout);
    auto start = chrono::high_resolution_clock::now();
#endif

    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1; //cin >> t;
    while(t--) solve();

#ifdef CDuongg
   auto end = chrono::high_resolution_clock::now();
   cout << "\n"; for(int i = 1; i <= 100; ++i) cout << '=';
   cout << "\nExecution time: " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
   cout << "Check array size pls sir" << endl;
#endif

}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32