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답안 #952134

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
952134 2024-03-23T06:33:21 Z GrindMachine Worst Reporter 4 (JOI21_worst_reporter4) C++17
100 / 100
 481 ms 141992 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
https://codeforces.com/blog/entry/88748?#comment-774017 (thread)
got the key idea, but didnt know how to implement in a clean way

implementation idea:
represent the subtree cost @u as a staircase function using a map
can be merged efficiently using small to large

*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<ll> adj[N];
vector<pll> a(N);
vector<ll> subsiz(N);
vector<bool> on_cyc(N);

void dfs1(ll u){
    subsiz[u] = 1;
    trav(v,adj[u]){
        if(on_cyc[v]) conts;
        dfs1(v);
        subsiz[u] += subsiz[v];
    }
}

map<ll,ll> mp[N];

void dfs2(ll u){
    pll best = {-1,-1};
    trav(v,adj[u]){
        if(on_cyc[v]) conts;
        pll px = {subsiz[v],v};
        amax(best,px);
    }

    ll heavy = best.ss;
    if(heavy == -1){
        auto [h,c] = a[u];
        mp[u][1] = 0;
        mp[u][h+1] = c;
        return;
    }

    dfs2(heavy);
    if(on_cyc[u]){
        mp[u] = mp[heavy];
    }
    else{
        swap(mp[u],mp[heavy]);
    }

    trav(v,adj[u]){
        if(on_cyc[v]) conts;
        if(v == heavy) conts;
        dfs2(v);
        for(auto [i,x] : mp[v]){
            mp[u][i] += x;
        }
        // mp[v].clear();
    }

    auto [h,c] = a[u];
    mp[u][1] += c;
    mp[u][h] -= c;
    mp[u][h+1] += c;

    auto it = mp[u].find(h);
    vector<ll> rem;

    ll val = mp[u][h], recent_h = h; 
    while(val < 0){
        it--;
        rem.pb(recent_h);
        recent_h = it->first;
        val += it->second;
    }

    mp[u][recent_h] = val;

    trav(x,rem){
        mp[u].erase(x);
    }
}

void solve(int test_case)
{
    ll n; cin >> n;
    vector<ll> par(n+5);

    rep1(i,n){
        ll p,h,c; cin >> p >> h >> c;
        adj[p].pb(i);
        par[i] = p;
        a[i] = {h,c};
    }

    vector<ll> outdeg(n+5);
    rep1(i,n) outdeg[i] = sz(adj[i]);

    queue<ll> q;
    rep1(i,n){
        if(outdeg[i] == 0){
            q.push(i);
        }
    }

    while(!q.empty()){
        ll u = q.front();
        q.pop();

        ll p = par[u];
        outdeg[p]--;
        if(outdeg[p] == 0){
            q.push(p);
        }
    }

    rep1(i,n){
        if(outdeg[i]){
            on_cyc[i] = 1;
        }
    }

    vector<bool> vis(n+5);
    ll ans = 0;

    rep1(i,n){
        if(vis[i] or !on_cyc[i]) conts;
        ll j = i;
        map<ll,ll> sum_mp;
        vector<ll> nodes;
        ll tot_sum = 0;

        while(!vis[j]){
            vis[j] = 1;
            nodes.pb(j);
            dfs1(j);
            dfs2(j);
            sum_mp[a[j].ff] += a[j].ss;
            tot_sum += a[j].ss;
            j = par[j];
        }

        map<ll,ll> cost_mp;
        cost_mp[1] += 0;
        ll cost_sum = 0;

        trav(u,nodes){
            cost_mp[a[u].ff] += 0;
            trav(v,adj[u]){
                if(on_cyc[v]) conts;
                for(auto [i,x] : mp[v]){
                    cost_mp[i] += x;
                }
            }
        }

        ll cost = inf2;

        for(auto [h,delta] : cost_mp){
            cost_sum += delta;
            ll curr_cost = cost_sum+tot_sum-sum_mp[h];
            amin(cost,curr_cost);
        }

        ans += cost;
    }

    cout << ans << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

Subtask #1
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 19036 KB Output is correct
2 Correct 7 ms 19280 KB Output is correct
3 Correct 5 ms 19036 KB Output is correct
4 Correct 5 ms 19032 KB Output is correct
5 Correct 11 ms 21084 KB Output is correct
6 Correct 9 ms 20060 KB Output is correct
7 Correct 8 ms 19804 KB Output is correct
8 Correct 11 ms 21084 KB Output is correct
9 Correct 9 ms 20060 KB Output is correct
10 Correct 9 ms 19800 KB Output is correct
11 Correct 7 ms 19544 KB Output is correct
12 Correct 10 ms 20572 KB Output is correct
13 Correct 8 ms 20316 KB Output is correct
14 Correct 9 ms 20060 KB Output is correct
15 Correct 9 ms 19804 KB Output is correct
16 Correct 12 ms 21340 KB Output is correct
17 Correct 9 ms 20212 KB Output is correct
18 Correct 7 ms 19676 KB Output is correct
19 Correct 10 ms 20828 KB Output is correct
20 Correct 8 ms 20056 KB Output is correct
21 Correct 7 ms 20056 KB Output is correct
22 Correct 10 ms 20828 KB Output is correct
23 Correct 8 ms 20060 KB Output is correct
24 Correct 10 ms 20828 KB Output is correct
25 Correct 8 ms 20316 KB Output is correct
26 Correct 11 ms 22104 KB Output is correct
27 Correct 10 ms 21084 KB Output is correct
28 Correct 13 ms 21340 KB Output is correct
29 Correct 10 ms 21340 KB Output is correct
30 Correct 10 ms 20948 KB Output is correct
31 Correct 11 ms 20828 KB Output is correct

Subtask #2
65.0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 19036 KB Output is correct
2 Correct 7 ms 19280 KB Output is correct
3 Correct 5 ms 19036 KB Output is correct
4 Correct 5 ms 19032 KB Output is correct
5 Correct 11 ms 21084 KB Output is correct
6 Correct 9 ms 20060 KB Output is correct
7 Correct 8 ms 19804 KB Output is correct
8 Correct 11 ms 21084 KB Output is correct
9 Correct 9 ms 20060 KB Output is correct
10 Correct 9 ms 19800 KB Output is correct
11 Correct 7 ms 19544 KB Output is correct
12 Correct 10 ms 20572 KB Output is correct
13 Correct 8 ms 20316 KB Output is correct
14 Correct 9 ms 20060 KB Output is correct
15 Correct 9 ms 19804 KB Output is correct
16 Correct 12 ms 21340 KB Output is correct
17 Correct 9 ms 20212 KB Output is correct
18 Correct 7 ms 19676 KB Output is correct
19 Correct 10 ms 20828 KB Output is correct
20 Correct 8 ms 20056 KB Output is correct
21 Correct 7 ms 20056 KB Output is correct
22 Correct 10 ms 20828 KB Output is correct
23 Correct 8 ms 20060 KB Output is correct
24 Correct 10 ms 20828 KB Output is correct
25 Correct 8 ms 20316 KB Output is correct
26 Correct 11 ms 22104 KB Output is correct
27 Correct 10 ms 21084 KB Output is correct
28 Correct 13 ms 21340 KB Output is correct
29 Correct 10 ms 21340 KB Output is correct
30 Correct 10 ms 20948 KB Output is correct
31 Correct 11 ms 20828 KB Output is correct
32 Correct 12 ms 21340 KB Output is correct
33 Correct 377 ms 114124 KB Output is correct
34 Correct 254 ms 65876 KB Output is correct
35 Correct 360 ms 111956 KB Output is correct
36 Correct 248 ms 65644 KB Output is correct
37 Correct 164 ms 47108 KB Output is correct
38 Correct 148 ms 42324 KB Output is correct
39 Correct 201 ms 74028 KB Output is correct
40 Correct 182 ms 73656 KB Output is correct
41 Correct 103 ms 73696 KB Output is correct
42 Correct 185 ms 53588 KB Output is correct
43 Correct 169 ms 53584 KB Output is correct
44 Correct 362 ms 141992 KB Output is correct
45 Correct 225 ms 82004 KB Output is correct
46 Correct 90 ms 42168 KB Output is correct
47 Correct 289 ms 90452 KB Output is correct
48 Correct 136 ms 62964 KB Output is correct
49 Correct 106 ms 62296 KB Output is correct
50 Correct 318 ms 90060 KB Output is correct
51 Correct 103 ms 52848 KB Output is correct
52 Correct 318 ms 92128 KB Output is correct
53 Correct 128 ms 63692 KB Output is correct
54 Correct 316 ms 123660 KB Output is correct
55 Correct 269 ms 99444 KB Output is correct
56 Correct 258 ms 106940 KB Output is correct
57 Correct 259 ms 112664 KB Output is correct
58 Correct 297 ms 90312 KB Output is correct
59 Correct 305 ms 90396 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 19036 KB Output is correct
2 Correct 7 ms 19280 KB Output is correct
3 Correct 5 ms 19036 KB Output is correct
4 Correct 5 ms 19032 KB Output is correct
5 Correct 11 ms 21084 KB Output is correct
6 Correct 9 ms 20060 KB Output is correct
7 Correct 8 ms 19804 KB Output is correct
8 Correct 11 ms 21084 KB Output is correct
9 Correct 9 ms 20060 KB Output is correct
10 Correct 9 ms 19800 KB Output is correct
11 Correct 7 ms 19544 KB Output is correct
12 Correct 10 ms 20572 KB Output is correct
13 Correct 8 ms 20316 KB Output is correct
14 Correct 9 ms 20060 KB Output is correct
15 Correct 9 ms 19804 KB Output is correct
16 Correct 12 ms 21340 KB Output is correct
17 Correct 9 ms 20212 KB Output is correct
18 Correct 7 ms 19676 KB Output is correct
19 Correct 10 ms 20828 KB Output is correct
20 Correct 8 ms 20056 KB Output is correct
21 Correct 7 ms 20056 KB Output is correct
22 Correct 10 ms 20828 KB Output is correct
23 Correct 8 ms 20060 KB Output is correct
24 Correct 10 ms 20828 KB Output is correct
25 Correct 8 ms 20316 KB Output is correct
26 Correct 11 ms 22104 KB Output is correct
27 Correct 10 ms 21084 KB Output is correct
28 Correct 13 ms 21340 KB Output is correct
29 Correct 10 ms 21340 KB Output is correct
30 Correct 10 ms 20948 KB Output is correct
31 Correct 11 ms 20828 KB Output is correct
32 Correct 12 ms 21340 KB Output is correct
33 Correct 377 ms 114124 KB Output is correct
34 Correct 254 ms 65876 KB Output is correct
35 Correct 360 ms 111956 KB Output is correct
36 Correct 248 ms 65644 KB Output is correct
37 Correct 164 ms 47108 KB Output is correct
38 Correct 148 ms 42324 KB Output is correct
39 Correct 201 ms 74028 KB Output is correct
40 Correct 182 ms 73656 KB Output is correct
41 Correct 103 ms 73696 KB Output is correct
42 Correct 185 ms 53588 KB Output is correct
43 Correct 169 ms 53584 KB Output is correct
44 Correct 362 ms 141992 KB Output is correct
45 Correct 225 ms 82004 KB Output is correct
46 Correct 90 ms 42168 KB Output is correct
47 Correct 289 ms 90452 KB Output is correct
48 Correct 136 ms 62964 KB Output is correct
49 Correct 106 ms 62296 KB Output is correct
50 Correct 318 ms 90060 KB Output is correct
51 Correct 103 ms 52848 KB Output is correct
52 Correct 318 ms 92128 KB Output is correct
53 Correct 128 ms 63692 KB Output is correct
54 Correct 316 ms 123660 KB Output is correct
55 Correct 269 ms 99444 KB Output is correct
56 Correct 258 ms 106940 KB Output is correct
57 Correct 259 ms 112664 KB Output is correct
58 Correct 297 ms 90312 KB Output is correct
59 Correct 305 ms 90396 KB Output is correct
60 Correct 6 ms 19036 KB Output is correct
61 Correct 6 ms 19032 KB Output is correct
62 Correct 5 ms 19136 KB Output is correct
63 Correct 5 ms 19276 KB Output is correct
64 Correct 352 ms 97776 KB Output is correct
65 Correct 267 ms 58448 KB Output is correct
66 Correct 413 ms 85996 KB Output is correct
67 Correct 267 ms 57848 KB Output is correct
68 Correct 188 ms 44436 KB Output is correct
69 Correct 156 ms 41132 KB Output is correct
70 Correct 456 ms 74124 KB Output is correct
71 Correct 221 ms 58948 KB Output is correct
72 Correct 481 ms 85348 KB Output is correct
73 Correct 243 ms 60532 KB Output is correct
74 Correct 479 ms 86216 KB Output is correct
75 Correct 270 ms 61388 KB Output is correct
76 Correct 216 ms 60264 KB Output is correct
77 Correct 384 ms 88692 KB Output is correct
78 Correct 165 ms 57544 KB Output is correct
79 Correct 412 ms 99232 KB Output is correct
80 Correct 232 ms 63688 KB Output is correct
81 Correct 189 ms 54216 KB Output is correct
82 Correct 327 ms 85580 KB Output is correct
83 Correct 108 ms 58704 KB Output is correct
84 Correct 375 ms 92724 KB Output is correct
85 Correct 376 ms 93012 KB Output is correct
86 Correct 354 ms 87300 KB Output is correct
87 Correct 360 ms 92608 KB Output is correct
88 Correct 367 ms 92740 KB Output is correct