Submission #796757

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
796757	2023-07-28 17:24:08	fuad27	Event Hopping (BOI22_events)	C++17	100 / 100	247 ms	44280 KiB

events

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#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
const int N=200'010;
const int LG=20;
struct event {
  int s, e, idx;
};
event es[N];
struct Binary_Lifting {
  int up[N][LG];
  void add(int node, int par) {
    up[node][0]=par;
    for(int i = 1;i<LG;i++) {
      up[node][i]=up[up[node][i-1]][i-1];
    }
  }
  int get(int start, int num) {
    if(es[start].e>=num)return 1;
    int res=1;
    for(int i = LG-1;i>=0;i--) {
      if(es[up[start][i]].e<num) {
        start=up[start][i];
        res+=(1<<i);
      }
    }
    if(es[up[start][0]].e>=num)return res+1;
    return -1;
  }
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30