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답안 #399368

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
399368 2021-05-05T15:44:19 Z 12tqian Worst Reporter 4 (JOI21_worst_reporter4) C++17
14 / 100
 23 ms 3404 KB 
#include <bits/stdc++.h>

using namespace std;

#define f1r(i, a, b) for (int i = a; i < b; ++i)
#define f0r(i, a) f1r(i, 0, a)
#define each(t, a) for (auto& t : a)

#define mp make_pair
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;

template <class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template <class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

template <class T> int get_pos(vector<T> v, T x) {
    return lower_bound(all(v), x) - v.begin();
}

const int N = 2e5 + 5;

struct DSU {
    vi e;
    
    void init(int n) {
        e = vi(n, -1);
    }

    int get(int x) {
        return e[x] < 0 ? x : e[x] = get(e[x]);
    }

    int size(int x) {
        return -e[get(x)];
    }

    bool unite(int x, int y) {
        x = get(x), y = get(y);
        if (x == y) return false;
        if (e[x] > e[y]) swap(x, y);
        e[x] += e[y]; e[y] = x;
        return true;
    }
};


int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n; cin >> n;
    vi a(n);
    vi h(n);
    vl c(n);
    vector<bool> vis(n);
    vector<bool> cyc(n);
    vi tmp;
    if (n > 5002) return 0;
    f0r(i, n) {
        cin >> a[i] >> h[i] >> c[i];
        --a[i];
        tmp.pb(h[i]);
    }
    sort(all(tmp));
    tmp.erase(unique(all(tmp)), tmp.end());
    f0r(i, n) h[i] = get_pos(tmp, h[i]);
    f0r(i, n) h[i] = sz(tmp) - 1 - h[i];
    DSU D; D.init(n);
    f0r(i, n) {
        if (vis[i]) continue;
        int cur = i;
        vi path;
        while (!vis[cur]) {
            vis[cur] = true;
            path.pb(cur);
            cur = a[cur];
        }
        int loc = -1;
        f0r(i, sz(path)) {
            if (path[i] == cur) {
                loc = i;
                break;
            }
        }
        if (loc == -1) continue;
        f1r(i, loc, sz(path)) {
            cyc[path[i]] = true;
            D.unite(cur, path[i]);
        }
    }
    vi v;
    f0r(i, n) v.pb(D.get(i));
    sort(all(v));
    v.erase(unique(all(v)), v.end());
    vi id(n);
    f0r(i, n) id[i] = get_pos(v, D.get(i));
    int sz = sz(v);
    vector<map<int, ll>> dp(sz);
    vector<vi> comps(sz);
    f0r(i, n) {
        comps[id[i]].pb(i);
    }
    vi roots;
    each(x, v) {
        if (cyc[comps[get_pos(v, x)][0]]) {
            roots.pb(get_pos(v, x));
        }
    }
    vector<vi> g(sz);
    f0r(i, n) {
        int x = id[i];
        int y = id[a[i]];
        if (x == y) continue;
        g[x].pb(y);
        g[y].pb(x);
    }
    ll ans = 0;
    int cnt = 0;
    each(r, roots) {
        function<void(int, int)> dfs = [&](int u, int p) {
            each(v, g[u]) {
                if (v == p) continue;
                dfs(v, u);
                if (sz(dp[v]) > sz(dp[u])) swap(dp[u], dp[v]);
                each(x, dp[v]) {
                    dp[u][x.f] += x.s;
                }
            } 
            // add the root
            auto& st = dp[u];
            if (u == r) {
                auto it = st.begin();
                while (it != st.end()) {
                    if (it != st.begin()) {
                        it->s += prev(it)->s;
                    }
                    it = next(it);
                }
                map<int, ll> cost;
                each(vert, comps[u]) {
                    cost[h[vert]] += c[vert];
                }
                ll mx = 0;
                if (sz(st)) mx = st.rbegin()->s;
                each(vert, cost) {
                    int d = vert.f;
                    ll v = vert.s;
                    it = st.upper_bound(d);
                    if (it != st.begin()) {
                        ckmax(mx, prev(it)->s + v);
                    }
                    ckmax(mx, v);
                }
                ans += mx;
            } else {
                int vert = comps[u][0];
                int d = h[vert];
                ll v = c[vert];
                st[d] += v;
                auto it = st.upper_bound(d);
                while (it != st.end() && v) {
                    ll rem = min(v, it->s);
                    it->s -= rem;
                    v -= rem;
                    if (it->s == 0) {
                        it = next(it);
                        st.erase(prev(it));
                    }
                }
            }
        };
        dfs(r, -1);
    }
    ll sum = 0;
    f0r(i, n) sum += c[i];
    ans = sum - ans;
    cout << ans << '\n';
    return 0;
}

/**
 * goes to a[i]
 * maximize the cost if decreasing subsequences up the tree
 * let's consider the cycle at the very end
 * then there is a cost associated with each possible value at the top
 * and a cost associated with nothing
 * first consider the case of fixed
 * things decrease from the root
 * this means that in increasing order it's better
 */

Compilation message

worst_reporter2.cpp: In function 'int main()':
worst_reporter2.cpp:128:9: warning: unused variable 'cnt' [-Wunused-variable]
  128 |     int cnt = 0;
      |         ^~~

Subtask #1
14.0 / 14.0

# 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 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 23 ms 2164 KB Output is correct
6 Correct 16 ms 1804 KB Output is correct
7 Correct 16 ms 1540 KB Output is correct
8 Correct 22 ms 2308 KB Output is correct
9 Correct 16 ms 1740 KB Output is correct
10 Correct 15 ms 1544 KB Output is correct
11 Correct 14 ms 1356 KB Output is correct
12 Correct 20 ms 2124 KB Output is correct
13 Correct 14 ms 2176 KB Output is correct
14 Correct 20 ms 1672 KB Output is correct
15 Correct 16 ms 1664 KB Output is correct
16 Correct 23 ms 2624 KB Output is correct
17 Correct 16 ms 1924 KB Output is correct
18 Correct 14 ms 1356 KB Output is correct
19 Correct 20 ms 2056 KB Output is correct
20 Correct 15 ms 1788 KB Output is correct
21 Correct 14 ms 1788 KB Output is correct
22 Correct 20 ms 1868 KB Output is correct
23 Correct 15 ms 1512 KB Output is correct
24 Correct 20 ms 1988 KB Output is correct
25 Correct 17 ms 1920 KB Output is correct
26 Correct 18 ms 2176 KB Output is correct
27 Correct 22 ms 1988 KB Output is correct
28 Correct 20 ms 2124 KB Output is correct
29 Correct 20 ms 2240 KB Output is correct
30 Correct 21 ms 2124 KB Output is correct
31 Correct 20 ms 2124 KB Output is correct

Subtask #2
0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 2184 KB Output is correct
2 Incorrect 3 ms 3404 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# 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 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 23 ms 2164 KB Output is correct
6 Correct 16 ms 1804 KB Output is correct
7 Correct 16 ms 1540 KB Output is correct
8 Correct 22 ms 2308 KB Output is correct
9 Correct 16 ms 1740 KB Output is correct
10 Correct 15 ms 1544 KB Output is correct
11 Correct 14 ms 1356 KB Output is correct
12 Correct 20 ms 2124 KB Output is correct
13 Correct 14 ms 2176 KB Output is correct
14 Correct 20 ms 1672 KB Output is correct
15 Correct 16 ms 1664 KB Output is correct
16 Correct 23 ms 2624 KB Output is correct
17 Correct 16 ms 1924 KB Output is correct
18 Correct 14 ms 1356 KB Output is correct
19 Correct 20 ms 2056 KB Output is correct
20 Correct 15 ms 1788 KB Output is correct
21 Correct 14 ms 1788 KB Output is correct
22 Correct 20 ms 1868 KB Output is correct
23 Correct 15 ms 1512 KB Output is correct
24 Correct 20 ms 1988 KB Output is correct
25 Correct 17 ms 1920 KB Output is correct
26 Correct 18 ms 2176 KB Output is correct
27 Correct 22 ms 1988 KB Output is correct
28 Correct 20 ms 2124 KB Output is correct
29 Correct 20 ms 2240 KB Output is correct
30 Correct 21 ms 2124 KB Output is correct
31 Correct 20 ms 2124 KB Output is correct
32 Correct 22 ms 2184 KB Output is correct
33 Incorrect 3 ms 3404 KB Output isn't correct
34 Halted 0 ms 0 KB -