Submission #632020

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
632020	2022-08-19 10:13:22	CyanForces	Thousands Islands (IOI22_islands)	C++17	100 / 100	317 ms	36276 KiB

islands

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#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define debug(...) //ignore
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef long double ld;
variant<bool, vi> find_journey(int n, int m, vi u, vi v) {
  vi dead(n);
  vector<set<int>> rg(n), g(n);
  rep(i,0,m) {
    g[u[i]].emplace(i);
    rg[v[i]].emplace(i);
  }
  queue<int> q;
  rep(x,0,n) if(sz(g[x]) == 0) q.emplace(x);
  auto del = [&](int e) {
    g[u[e]].erase(e);
    rg[v[e]].erase(e);
    if(sz(g[u[e]]) == 0) q.emplace(u[e]);
  };
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 21 / 21
• Subtask 4: 24 / 24
• Subtask 5: 45 / 45