Submission #1133822

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1133822	2025-01-08 23:58:32	Math4Life2020	Road Closures (APIO21_roads)	C++20	36 / 100	2033 ms	40736 KiB

roads

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#include "roads.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long; using pii = pair<ll,ll>;
mt19937 gen;
const ll Nm = 1e5+5; ll N;
const ll K = 250; //sqrt(N)
ll ans[Nm];
vector<pii> adj[Nm];
vector<ll> fadj[Nm];
ll deg[Nm];
pii radj[Nm]; //{number, cost}
vector<ll> itpl; //inverse topological sort
ll dp0[Nm]; //no path up
ll dp1[Nm]; //path up
ll qsel(ll nv, vector<ll> v0) { //quickselect bottom nv elements
  if (nv==0) {
    return 0;
  }
  vector<ll> v1,v2; ll neq=0; //bottom, top, # equal
  ll s1=0,s2=0;
  ll x = v0[gen()%(v0.size())];
  for (ll y: v0) {
    if (y<x) {
      v1.push_back(y);
      s1+=y;
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 14 / 14
• Subtask 4: 10 / 10
• Subtask 5: 0 / 17
• Subtask 6: 0 / 25
• Subtask 7: 0 / 22