Submission #677283

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
677283	2023-01-02 17:48:58	dsyz	Solar Storm (NOI20_solarstorm)	C++17	100 / 100	619 ms	221220 KiB

SolarStorm

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define MAXN (1000005)
vector<ll> v[MAXN];
int parent[20][MAXN]; //(2^19 + 2^18 + 2^17 ... + 2^0) = (2^20 - 1) which is > 10^6
bool visited[MAXN];
void dfs(ll x){
  visited[x] = 1;
  for(auto u : v[x]){
    if(!visited[u]){
      parent[0][u] = x;
      visited[u] = 1;
      dfs(u);
    }
  }
}
ll fp(ll x,ll k){
  for(ll i = 19;i >= 0;i--){
    if(k >= (1<<i)){
      if(x == -1) return -1;
      x = parent[i][x];
      k -= (1<<i);
    }
  }
  return x;
}
int main() {
  ios_base::sync_with_stdio(false);cin.tie(0);
  ll N,S,K;
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 7 / 7
• Subtask 3: 11 / 11
• Subtask 4: 8 / 8
• Subtask 5: 18 / 18
• Subtask 6: 16 / 16
• Subtask 7: 30 / 30