Submission #1051440

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051440		mindiyak	Jobs (BOI24_jobs)	C++17	14 / 100	2058 ms	10972 KiB

Main

#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (ll i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int MOD = 1e9+7;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}

int N = 4e5;
vi parent (N,0);
vi sons(N,-1);
vi roots;
vl profit(N,0);

ll ans = 0;
int head = -1;
int tmpchange = 0;

void proc(int pos,ll money){
    if(money < 0)return;

    money += profit[pos];

    if(money > ans){
        tmpchange = 1;
        ans = money;
        head = sons[pos];
    }

    if(sons[pos] != -1)
        proc(sons[pos],money);
}


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

    FOR(i,0,n){
        ll a;int b;cin >> a >> b;
        b --;
        if(b == -1){
            roots.pb(i);
        }else{
            parent[i] = b;
            sons[b] = i;
        }
        profit[i] = a;
    }

    ans = s;

    vi temp;
    for(int a:roots){
        if(sons[a] == -1){
            if(profit[a] >= 0){
                ans += profit[a];
            }
        }else{
            temp.pb(a);
        }
    }
    roots = temp;

    int change = 1;
    while(change == 1){
        change = 0;
        vi temp;
        for(int a:roots){
            head = a;
            tmpchange = 0;
            proc(a,ans);
            change = max(tmpchange,change);
            if(head != -1)
                temp.pb(head);
        }
        roots = temp;
    }

    cout << ans - s << endl;

}


int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void init(std::string)':
Main.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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