oj.uz

답안 #389613

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
389613 2021-04-14T09:37:42 Z maksim1744 Election Campaign (JOI15_election_campaign) C++17
100 / 100
 348 ms 68932 KB 
/*
    author:  Maksim1744
    created: 14.04.2021 11:51:00
*/

#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

#define mp   make_pair
#define pb   push_back
#define eb   emplace_back

#define sum(a)     ( accumulate ((a).begin(), (a).end(), 0ll))
#define mine(a)    (*min_element((a).begin(), (a).end()))
#define maxe(a)    (*max_element((a).begin(), (a).end()))
#define mini(a)    ( min_element((a).begin(), (a).end()) - (a).begin())
#define maxi(a)    ( max_element((a).begin(), (a).end()) - (a).begin())
#define lowb(a, x) ( lower_bound((a).begin(), (a).end(), (x)) - (a).begin())
#define uppb(a, x) ( upper_bound((a).begin(), (a).end(), (x)) - (a).begin())

template<typename T>             vector<T>& operator--            (vector<T> &v){for (auto& i : v) --i;            return  v;}
template<typename T>             vector<T>& operator++            (vector<T> &v){for (auto& i : v) ++i;            return  v;}
template<typename T>             istream& operator>>(istream& is,  vector<T> &v){for (auto& i : v) is >> i;        return is;}
template<typename T>             ostream& operator<<(ostream& os,  vector<T>  v){for (auto& i : v) os << i << ' '; return os;}
template<typename T, typename U> pair<T,U>& operator--           (pair<T, U> &p){--p.first; --p.second;            return  p;}
template<typename T, typename U> pair<T,U>& operator++           (pair<T, U> &p){++p.first; ++p.second;            return  p;}
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U> &p){is >> p.first >> p.second;        return is;}
template<typename T, typename U> ostream& operator<<(ostream& os, pair<T, U>  p){os << p.first << ' ' << p.second; return os;}
template<typename T, typename U> pair<T,U> operator-(pair<T,U> a, pair<T,U> b){return mp(a.first-b.first, a.second-b.second);}
template<typename T, typename U> pair<T,U> operator+(pair<T,U> a, pair<T,U> b){return mp(a.first+b.first, a.second+b.second);}
template<typename T, typename U> void umin(T& a, U b){if (a > b) a = b;}
template<typename T, typename U> void umax(T& a, U b){if (a < b) a = b;}

#ifdef HOME
#define SHOW_COLORS
#include "C:/C++ libs/print.cpp"
#else
#define show(...)     42
#define mclock        42
#define shows         42
#define debug if (false)
#endif

vector<int> lca_ind;
vector<vector<int>> lca_sparse;
vector<int> lca_p2;
vector<int> lca_depth;
void build_lca_sparse(vector<vector<int>>& g, int root = 0) {
    int n = g.size();
    vector<int> euler;
    lca_ind.resize(n);
    lca_depth.assign(n, -1);
    function<void(int, int)> dfs = [&](int v, int depth) {
        lca_ind[v] = euler.size();
        euler.pb(v);
        lca_depth[v] = depth;
        for (auto k : g[v]) {
            if (lca_depth[k] == -1) {
                dfs(k, depth + 1);
                euler.pb(v);
            }
        }
    };
    dfs(root, 0);
    int m = euler.size();
    int log = 1;
    while ((1 << log) < m)
        ++log;
    lca_sparse.resize(log);
    lca_sparse[0].resize(m);
    lca_p2.resize(m + 1);
    int pp2 = 0;
    for (int i = 1; i < lca_p2.size(); ++i) {
        if (1 << (pp2 + 1) <= i)
            ++pp2;
        lca_p2[i] = pp2;
    }
    lca_p2[0] = 0;
    for (int i = 0; i < m; ++i)
        lca_sparse[0][i] = euler[i];
    for (int i = 1; i < log; ++i) {
        lca_sparse[i].assign(m, 0);
        for (int j = 0; j < m - (1 << (i - 1)); ++j) {
            int v1 = lca_sparse[i - 1][j], v2 = lca_sparse[i - 1][j + (1 << (i - 1))];
            if (lca_depth[v1] < lca_depth[v2])
                lca_sparse[i][j] = v1;
            else
                lca_sparse[i][j] = v2;
        }
    }
}

int get_lca(int u, int v) {
    if (u == v)
        return u;
    u = lca_ind[u];
    v = lca_ind[v];
    if (u > v)
        swap(u, v);
    int v1 = lca_sparse[lca_p2[v - u + 1]][u], v2 = lca_sparse[lca_p2[v - u + 1]][v - (1 << lca_p2[v - u + 1]) + 1];
    if (lca_depth[v1] < lca_depth[v2])
        return v1;
    else
        return v2;
}

int dist(int u, int v) {
    return lca_depth[u] + lca_depth[v] - 2 * lca_depth[get_lca(u, v)];
}

struct item {
    int sm = 0;
    int md = 0;

    template<typename T>
    void init(const T &t, int l, int r) {
        sm = t;
        md = 0;
    }

    void update(const item &first, const item &second, int l, int r) {
        sm = first.sm + second.sm;
    }

    static item merge(const item &first, const item &second, int l, int r) {
        item res;
        res.update(first, second, l, r);  // careful with different lengths
        return res;
    }

    template<typename Modifier>
    void modify(const Modifier &m, int l, int r) {
        // apply here, save for children
        md += m;
        sm += m * (r - l + 1);
    }

    void push(item &first, item &second, int l, int r) {
        int m = (l + r) / 2;
        first.modify(md, l, m);
        second.modify(md, m + 1, r);
        // reset modifier
        md = 0;
    }
};

string to_string(const item &i) {
    stringstream ss;
    ss << "[" << "]";
    return ss.str();
}
ostream& operator << (ostream &o, const item &i) {
    return o << to_string(i);
}

struct segtree {
    vector<item> tree;
    int n = 1;

    segtree(int n = 1) : n(n) {
        tree.resize(1 << (__lg(n - 1) + 2));
    }

    template<typename T>
    void build(const vector<T> &v, int i, int l, int r) {
        if (l == r) {
            tree[i].init(v[l], l, r);
            return;
        }
        int m = (l + r) >> 1;
        build(v, i * 2 + 1, l, m);
        build(v, i * 2 + 2, m + 1, r);
        tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], l, r);
    }

    template<typename T>
    void build(const vector<T> &v) {
        n = v.size();
        tree.resize(1 << (__lg(n - 1) + 2));
        build(v, 0, 0, n - 1);
    }

    item ask(int l, int r, int i, int vl, int vr) {
        if (vl != vr) {
            tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
        }
        if (l == vl && r == vr) {
            return tree[i];
        }
        int m = (vl + vr) >> 1;
        if (r <= m) {
            return ask(l, r, i * 2 + 1, vl, m);
        } else if (m < l) {
            return ask(l, r, i * 2 + 2, m + 1, vr);
        } else {
            return item::merge(ask(l, m, i * 2 + 1, vl, m), ask(m + 1, r, i * 2 + 2, m + 1, vr), l, r);
        }
    }

    item ask(int l, int r) {
        l = max(l, 0); r = min(r, n - 1);
        if (l > r) return item();
        return ask(l, r, 0, 0, n - 1);
    }

    template<typename T>
    void set(int ind, const T &t) {
        static array<pair<int, int>, 30> st;
        int l = 0, r = n - 1, i = 0;
        int ptr = -1;
        while (l != r) {
            if (l != r) {
                tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], l, r);
            }
            st[++ptr] = {l, r};
            int m = (l + r) >> 1;
            if (ind <= m) {
                i = i * 2 + 1;
                r = m;
            } else {
                i = i * 2 + 2;
                l = m + 1;
            }
        }
        tree[i].init(t, l, r);
        while (i != 0) {
            i = (i - 1) / 2;
            tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], st[ptr].first, st[ptr].second);
            --ptr;
        }
    }

    template<typename Modifier>
    void modify(int l, int r, const Modifier &modifier, int i, int vl, int vr) {
        if (vl != vr) {
            tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
        }
        if (l == vl && r == vr) {
            tree[i].modify(modifier, vl, vr);
            return;
        }
        int m = (vl + vr) >> 1;
        if (r <= m) {
            modify(l, r, modifier, i * 2 + 1, vl, m);
        } else if (m < l) {
            modify(l, r, modifier, i * 2 + 2, m + 1, vr);
        } else {
            modify(l, m, modifier, i * 2 + 1, vl, m);
            modify(m + 1, r, modifier, i * 2 + 2, m + 1, vr);
        }
        tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
    }

    template<typename Modifier>
    void modify(int l, int r, const Modifier &modifier) {
        l = max(l, 0); r = min(r, n - 1);
        if (l > r) return;
        modify(l, r, modifier, 0, 0, n - 1);
    }
};

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

    int n;
    cin >> n;
    vector<vector<int>> g(n);
    for (int i = 0; i < n - 1; ++i) {
        int u, v;
        cin >> u >> v;
        --u; --v;
        g[u].push_back(v);
        g[v].push_back(u);
    }

    build_lca_sparse(g, 0);

    int m;
    cin >> m;

    vector<vector<pair<pair<int, int>, int>>> here(n);

    for (int i = 0; i < m; ++i) {
        int a, b, c;
        cin >> a >> b >> c;
        --a; --b;
        here[get_lca(a, b)].eb(mp(a, b), c);
    }

    vector<int> dp(n, 0);
    vector<bool> u(n, false);
    // ind is index in euler tour, [L[v], R[v]] is a segment in this tour corresponding to subtree of vertex v
    vector<int> L(n), R(n), ind(n);
    vector<int> lvl(n, 0);

    segtree tree(n);

    int icur = 0;

    // binary lifting to be able to find child of v, which has vertex x in a subtree
    vector<vector<int>> up(20, vector<int>(n, -1));
    {
        vector<bool> u(n, false);
        function<void(int)> dfs1 = [&](int v) {
            u[v] = true;
            for (int k : g[v]) {
                if (!u[k]) {
                    up[0][k] = v;
                    dfs1(k);
                }
            }
        };
        dfs1(0);
        for (int i = 1; i < up.size(); ++i)
            for (int j = 0; j < n; ++j)
                if (up[i - 1][j] != -1)
                    up[i][j] = up[i - 1][up[i - 1][j]];
    }
    auto go_up = [&](int v, int k) {
        for (int i = 0; i < up.size(); ++i)
            if ((k >> i) & 1)
                v = up[i][v];
        return v;
    };

    function<void(int)> dfs = [&](int v) {
        u[v] = true;
        ind[v] = icur;
        ++icur;
        L[v] = R[v] = ind[v];
        int dp0 = 0;
        vector<int> ch;
        for (int k : g[v]) {
            if (!u[k]) {
                ch.pb(k);
                lvl[k] = lvl[v] + 1;
                dfs(k);
                L[v] = min(L[v], L[k]);
                R[v] = max(R[v], R[k]);
                dp0 += dp[k];
            }
        }
        dp[v] = dp0;
        for (auto [ab, c] : here[v]) {
            auto [a, b] = ab;
            int cur = dp0;
            for (int ch : vector<int>{a, b}) {
                if (ch != v) {
                    // subtract answer for a child of v, containing ch in a subtree
                    cur -= dp[go_up(ch, lvl[ch] - lvl[v] - 1)];
                    // add value along the path
                    cur += tree.ask(ind[ch], ind[ch]).sm;
                }
            }
            dp[v] = max(dp[v], cur + c);
        }
        for (int k : ch) {
            tree.modify(L[k], R[k], dp0 - dp[k]);
        }
        tree.set(ind[v], dp0);
    };

    dfs(0);
    cout << dp[0] << '\n';

    return 0;
}

Compilation message

election_campaign.cpp: In function 'void build_lca_sparse(std::vector<std::vector<int> >&, int)':
election_campaign.cpp:77:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |     for (int i = 1; i < lca_p2.size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:318:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  318 |         for (int i = 1; i < up.size(); ++i)
      |                         ~~^~~~~~~~~~~
election_campaign.cpp: In lambda function:
election_campaign.cpp:324:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  324 |         for (int i = 0; i < up.size(); ++i)
      |                         ~~^~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 195 ms 36284 KB Output is correct
6 Correct 135 ms 66912 KB Output is correct
7 Correct 188 ms 56104 KB Output is correct
8 Correct 140 ms 36516 KB Output is correct
9 Correct 194 ms 49912 KB Output is correct
10 Correct 133 ms 36520 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 2 ms 844 KB Output is correct
4 Correct 221 ms 68904 KB Output is correct
5 Correct 237 ms 68808 KB Output is correct
6 Correct 210 ms 68932 KB Output is correct
7 Correct 237 ms 68776 KB Output is correct
8 Correct 221 ms 68848 KB Output is correct
9 Correct 205 ms 68780 KB Output is correct
10 Correct 223 ms 68888 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 2 ms 844 KB Output is correct
4 Correct 221 ms 68904 KB Output is correct
5 Correct 237 ms 68808 KB Output is correct
6 Correct 210 ms 68932 KB Output is correct
7 Correct 237 ms 68776 KB Output is correct
8 Correct 221 ms 68848 KB Output is correct
9 Correct 205 ms 68780 KB Output is correct
10 Correct 223 ms 68888 KB Output is correct
11 Correct 14 ms 1284 KB Output is correct
12 Correct 271 ms 68892 KB Output is correct
13 Correct 221 ms 68776 KB Output is correct
14 Correct 209 ms 68780 KB Output is correct
15 Correct 219 ms 68776 KB Output is correct
16 Correct 206 ms 68808 KB Output is correct
17 Correct 272 ms 68904 KB Output is correct
18 Correct 224 ms 68788 KB Output is correct
19 Correct 207 ms 68868 KB Output is correct
20 Correct 219 ms 68832 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 337 ms 37944 KB Output is correct
2 Correct 204 ms 68900 KB Output is correct
3 Correct 343 ms 56948 KB Output is correct
4 Correct 237 ms 38096 KB Output is correct
5 Correct 299 ms 54824 KB Output is correct
6 Correct 227 ms 38268 KB Output is correct
7 Correct 337 ms 54372 KB Output is correct
8 Correct 258 ms 38148 KB Output is correct
9 Correct 207 ms 68904 KB Output is correct
10 Correct 348 ms 50788 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 195 ms 36284 KB Output is correct
6 Correct 135 ms 66912 KB Output is correct
7 Correct 188 ms 56104 KB Output is correct
8 Correct 140 ms 36516 KB Output is correct
9 Correct 194 ms 49912 KB Output is correct
10 Correct 133 ms 36520 KB Output is correct
11 Correct 2 ms 588 KB Output is correct
12 Correct 2 ms 844 KB Output is correct
13 Correct 2 ms 716 KB Output is correct
14 Correct 2 ms 588 KB Output is correct
15 Correct 2 ms 588 KB Output is correct
16 Correct 2 ms 716 KB Output is correct
17 Correct 2 ms 588 KB Output is correct
18 Correct 2 ms 716 KB Output is correct
19 Correct 2 ms 588 KB Output is correct
20 Correct 2 ms 844 KB Output is correct

Subtask #6
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 195 ms 36284 KB Output is correct
6 Correct 135 ms 66912 KB Output is correct
7 Correct 188 ms 56104 KB Output is correct
8 Correct 140 ms 36516 KB Output is correct
9 Correct 194 ms 49912 KB Output is correct
10 Correct 133 ms 36520 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 2 ms 844 KB Output is correct
14 Correct 221 ms 68904 KB Output is correct
15 Correct 237 ms 68808 KB Output is correct
16 Correct 210 ms 68932 KB Output is correct
17 Correct 237 ms 68776 KB Output is correct
18 Correct 221 ms 68848 KB Output is correct
19 Correct 205 ms 68780 KB Output is correct
20 Correct 223 ms 68888 KB Output is correct
21 Correct 14 ms 1284 KB Output is correct
22 Correct 271 ms 68892 KB Output is correct
23 Correct 221 ms 68776 KB Output is correct
24 Correct 209 ms 68780 KB Output is correct
25 Correct 219 ms 68776 KB Output is correct
26 Correct 206 ms 68808 KB Output is correct
27 Correct 272 ms 68904 KB Output is correct
28 Correct 224 ms 68788 KB Output is correct
29 Correct 207 ms 68868 KB Output is correct
30 Correct 219 ms 68832 KB Output is correct
31 Correct 337 ms 37944 KB Output is correct
32 Correct 204 ms 68900 KB Output is correct
33 Correct 343 ms 56948 KB Output is correct
34 Correct 237 ms 38096 KB Output is correct
35 Correct 299 ms 54824 KB Output is correct
36 Correct 227 ms 38268 KB Output is correct
37 Correct 337 ms 54372 KB Output is correct
38 Correct 258 ms 38148 KB Output is correct
39 Correct 207 ms 68904 KB Output is correct
40 Correct 348 ms 50788 KB Output is correct
41 Correct 2 ms 588 KB Output is correct
42 Correct 2 ms 844 KB Output is correct
43 Correct 2 ms 716 KB Output is correct
44 Correct 2 ms 588 KB Output is correct
45 Correct 2 ms 588 KB Output is correct
46 Correct 2 ms 716 KB Output is correct
47 Correct 2 ms 588 KB Output is correct
48 Correct 2 ms 716 KB Output is correct
49 Correct 2 ms 588 KB Output is correct
50 Correct 2 ms 844 KB Output is correct
51 Correct 262 ms 38012 KB Output is correct
52 Correct 248 ms 68900 KB Output is correct
53 Correct 334 ms 51264 KB Output is correct
54 Correct 210 ms 38316 KB Output is correct
55 Correct 277 ms 37896 KB Output is correct
56 Correct 223 ms 68776 KB Output is correct
57 Correct 300 ms 52944 KB Output is correct
58 Correct 227 ms 38272 KB Output is correct
59 Correct 269 ms 38120 KB Output is correct
60 Correct 221 ms 68776 KB Output is correct
61 Correct 301 ms 53468 KB Output is correct
62 Correct 236 ms 38160 KB Output is correct
63 Correct 273 ms 37860 KB Output is correct
64 Correct 226 ms 68900 KB Output is correct
65 Correct 341 ms 53588 KB Output is correct
66 Correct 224 ms 38192 KB Output is correct
67 Correct 282 ms 37692 KB Output is correct
68 Correct 224 ms 68776 KB Output is correct
69 Correct 307 ms 48588 KB Output is correct
70 Correct 292 ms 38232 KB Output is correct