제출 #1001152

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1001152		LOLOLO	Jobs (BOI24_jobs)	C++17	0 / 100	65 ms	68652 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (ll)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
const int N = 2e5 + 10;
vector <int> ed[N], ed2[N];
int p[N][20], in[N], ou[N], timer = 1;
ll mi[N][20], dep[N];

void dfs(int u, ll mx, int cur) {
    if (dep[u] > mx) {
        ed2[cur].pb(u);
        mx = dep[u];
        cur = u;
    }

    mi[u][0] = dep[u];
    for (int j = 1; j < 20; j++) {
        mi[u][j] = min(mi[u][j - 1], mi[p[u][j - 1]][j - 1]);
    }

    in[u] = ++timer;
    for (auto x : ed[u]) {
        dep[x] = dep[u] + dep[x];
        dfs(x, mx, cur);
    }

    ou[u] = timer;
}

bool is(int a, int b) {
    return in[a] <= in[b] && ou[a] >= in[b];
}

ll path(int a, int b) {
    ll pr = 1e18;
    for (int j = 19; j >= 0; j--) {
        if (is(a, p[b][j]) == 0) {
            pr = min(pr, mi[b][j]);
            b = p[b][j];
        }
    }

    return pr;
}

ll solve() {
    int n;
    ll s;
    cin >> n >> s;

    for (int i = 1; i <= n; i++) {
        cin >> dep[i] >> p[i][0];
        ed[p[i][0]].pb(i);
    }

    for (int j = 1; j < 20; j++) 
        for (int i = 1; i <= n; i++)
            p[i][j] = p[p[i][j - 1]][j - 1];

    dfs(0, 0, 0);

    priority_queue <vector <ll>> pq;

    for (auto x : ed2[0]) {
        pq.push({path(0, x) - dep[x], dep[x] - dep[0], x});
    }

    ll st = s;

    while (sz(pq)) {
        auto t = pq.top();
        pq.pop();
        if (s + t[0] >= 0) {
            s += t[1];
        } else {
            break;
        }

        for (auto x : ed2[t[2]]) {
            pq.push({path(t[2], x) - dep[t[2]], dep[x] - dep[t[2]], x});
        }
    }

    return s - st;
}
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
 
    int t = 1;
    //cin >> t;
 
    while (t--) {
        cout << solve() << '\n';
    }
 
    return 0;
} 

• Subtask 1: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31