Submission #1057308

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057308		slivajan	Jobs (BOI24_jobs)	C++17	40 / 100	144 ms	39424 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long un;
typedef vector<un> vuc;
typedef pair<un, un> pun;

#define REP(i, a, b) for (un i = (un)a; i < (un)b; i++)
#define FEAC(i, a) for (auto&& i : a)
#define vec vector
#define ALL(x) (x).begin(), (x).end()

constexpr un INF = INT64_MAX;

vuc penize;
vuc predek;
vec<vuc> graph;
un N, s;

un rekurze(un v){

    un ret = penize[v];

    FEAC(s, graph[v]) ret += rekurze(s);

    return max((un)0, ret);
}

void easy(){
    un ret = 0;

    REP(i, 0, N) {
        if (predek[i] == -1) ret += rekurze(i);
    }

    cout << ret;
}


int main(){
    cin >> N >> s;

    penize = vuc(N);
    predek = vuc(N);

    REP(i, 0, N){
        cin >> penize[i] >> predek[i];
        predek[i]--;
    }

    if (s == 1e18) {
        graph = vec<vuc>(N);
        REP(i, 0, N){
            if (predek[i] != -1) graph[predek[i]].push_back(i);
        }
        easy();
        return 0;
    }


    vec<vuc> cesty;

    REP(i, 0, N){
        if (predek[i] == -1) cesty.push_back({});

        if (penize[i] != 0){
            cesty[cesty.size() - 1].push_back(penize[i]);
        }
    }

    un M = cesty.size();

    vec<vec<pun>> nab;

    REP(j, 0, M){
        vec<pun> new_nab = {{0, 0}};
        
        un req = 0;
        un zisk = 0;

        cesty[j].push_back(-1);

        REP(i, 0, cesty[j].size()-1){
            zisk += cesty[j][i];
            req = min(req, zisk);

            if ((cesty[j][i] > 0) and (cesty[j][i+1] < 0) and (zisk > 0)){
                new_nab.push_back({-req, zisk});
                zisk = 0;
                req = 0;
            }
        }
        new_nab.push_back({INF, INF});

        nab.push_back(new_nab);
    }

    vuc ptrs(M, 1);
    priority_queue<pun, vector<pun>, greater<pun>> kjuu;
    REP(i, 0, M) kjuu.push({nab[i][1].first, i});

    un curr = s;

    while(curr >= kjuu.top().first) {
        un j;
        tie(ignore, j) = kjuu.top(); kjuu.pop();

        curr += nab[j][ptrs[j]].second;
        kjuu.push({nab[j][ptrs[j]+1].first, j});
        ptrs[j]++;
    }

    cout << curr-s << endl;
}

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