Submission #900034

#	Time	Username	Problem	Language	Result	Execution time	Memory
900034		Egorsa	Two Currencies (JOI23_currencies)	C++14	100 / 100	4576 ms	40000 KiB

currencies

#include <bits/stdc++.h>

using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template <typename T>

using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

using ll = long long;
using ld = long double;
using ull = unsigned long long;

const int mod = 1e9 + 7;
const int MAX = 1e5 + 7;

mt19937_64 mt(chrono::steady_clock::now().time_since_epoch().count());

vector<pair<int, int>> g[MAX];
int A[MAX], B[MAX];
int tin[MAX];
int timer = 0;
vector<pair<int, int>> pj(MAX);
vector<int> pst(MAX);
vector<int> path;
vector<int> als[MAX];
vector<ll> f1(MAX, 0);
vector<int> f2(MAX, 0);

void add1(int p, ll x, int x2) {
    for (; p < MAX; p = (p | (p + 1))) {
        f1[p] += x;
        f2[p] += x2;
    }
}

ll sum1(int p) {
    ll res = 0;
    for (; p >= 0; p = (p & (p + 1)) - 1) {
        res += f1[p];
    }
    return res;
}

int sum2(int p) {
    int res = 0;
    for (; p >= 0; p = (p & (p + 1)) - 1) {
        res += f2[p];
    }
    return res;
}

void dfs(int v, int p) {
    tin[v] = timer - 1;
    for (auto [to, num] : g[v]) {
        if (to != p) {
            for (auto add : als[num]) {
                timer++;
                path.push_back(add);
            }
            dfs(to, v);
            for (auto add : als[num]) {
                timer++;
                path.push_back(add);
            }
        }
    }
}

pair<int, int> getpath(int v, int u) {
    if (tin[v] > tin[u]) swap(v, u);
    return {tin[v] + 1, tin[u]};
}

vector<int> cnts(MAX, 0);
int l = 0, r = 0;

void modify(int now) {
    // cout << now << ' ' << cnts[now] << ' ' << l << ' ' << r << '\n';
    if (cnts[now] == 1) {
        add1(pst[now], pj[now].second, 1);
    } else {
        add1(pst[now], -pj[now].second, -1);
    }
}
// int op = 0;
void upd(int nl, int nr) {
    while (r > nr) {
        // op++;
        cnts[path[r]]--;
        modify(path[r]);
        r--;
    }
    while (r < nr) {
        // op++;
        r++;
        cnts[path[r]]++;
        modify(path[r]);
    }
    while (l < nl) {
        // op++;
        cnts[path[l]]--;
        modify(path[l]);
        l++;
    }
    while (l > nl) {
        // op++;
        l--;
        cnts[path[l]]++;
        modify(path[l]);
    }
    // if (op > 3e7) cout << 1 / 0;
}

void solve() {
    int n, m, q;
    cin >> n >> m >> q;
    for (int i = 1; i < n; i++) {
        int v, u;
        cin >> v >> u;
        A[i] = v;
        B[i] = u;
        g[v].push_back({u, i});
        g[u].push_back({v, i});
    }
    for (int i = 1; i <= m; i++) {
        cin >> pj[i].first >> pj[i].second;
        als[pj[i].first].push_back(i);
    }
    vector<int> ps(m + 1);
    for (int i = 1; i <= m; i++) ps[i] = i;
    sort(ps.begin() + 1, ps.end(), [&](int p1, int p2) {
        return pj[p1].second < pj[p2].second;
    });
    int ptr = 0;
    for (int i = 1; i <= m; i++) {
        pst[ps[i]] = ++ptr;
    }
    dfs(1, 1);
    cnts[path[0]]++;
    modify(path[0]);
    vector<int> res(MAX, 0);
    int buben = 888;
    vector<array<ll, 5>> rq[MAX];
    for (int i = 0; i < q; i++) {
        ll v, u, a, b;
        cin >> v >> u >> a >> b;
        auto [L, R] = getpath(v, u);
        rq[R / buben].push_back({L, R, a, b, i});
    }
    for (int i = 0; i < 1000; i++) {
        if (rq[i].size()) {
            sort(rq[i].begin(), rq[i].end(), [&](auto p1, auto p2) {
                if (p1[0] == p2[0]) return p1[1] < p2[1];
                return p1[0] < p2[0];
            });
            for (auto [L, R, a, b, i] : rq[i]) {
                if (L > R) {
                    res[i] = a;
                    continue;
                }
                upd(L, R);
                if (sum1(ptr) <= b) {
                    res[i] = a;
                    continue;
                }
                int can = 0;
                for (int bt = 16; bt >= 0; bt--) {
                    int ncan = can + (1 << bt);
                    if (ncan <= ptr) {
                        if (sum1(ncan) <= b) {
                            can = ncan;
                        }
                    }
                }
                // cout << i << ' ' << can << '\n';
                int lf = sum2(ptr) - sum2(can);
                res[i] = a - lf;
            }
        }
    }
    for (int i = 0; i < q; i++) {
        cout << max(-1, res[i]) << '\n';
    }
}

int main() {
#ifdef __APPLE__
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(0); cin.tie(0);
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }
}

Compilation message (stderr)

currencies.cpp: In function 'void dfs(int, int)':
currencies.cpp:57:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   57 |     for (auto [to, num] : g[v]) {
      |               ^
currencies.cpp: In function 'void solve()':
currencies.cpp:150:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  150 |         auto [L, R] = getpath(v, u);
      |              ^
currencies.cpp:159:23: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  159 |             for (auto [L, R, a, b, i] : rq[i]) {
      |                       ^

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