Submission #1284408

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284408		Johan	Money (IZhO17_money)	C++20	100 / 100	111 ms	8632 KiB

money

#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-falign-jumps")
#pragma GCC optimize("-falign-loops")
#pragma GCC optimize("-falign-labels")
#pragma GCC optimize("-fdevirtualize")
#pragma GCC optimize("-fcaller-saves")
#pragma GCC optimize("-fcrossjumping")
#pragma GCC optimize("-fthread-jumps")
#pragma GCC optimize("-fdelete-null-pointer-checks")
#include<bits/stdc++.h>
using namespace std;
struct BIT {
  int n;
  vector < int > fw;  
  BIT (int n) : n(n){
    fw.assign(n + 1, 0);
  }
  void upd(int idx, int val){
    while(idx <= n){
      fw[idx] += val;
      idx += (idx & -idx);
    }
  }
  int ask(int idx){
    int rs = 0;
    while(idx > 0){
      rs += fw[idx];
      idx -= (idx & -idx);
    }
    return rs;
  }
  int get(int l, int r){
    if(l > r)return 0;
    return ask(r) - ask(l - 1);
  }
};
int main(){
  // freopen("input.txt", "r", stdin);
  // freopen("output.txt", "w", stdout);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int a[n + 1], idx = 1;
  for(int i = 1; i <= n; i++)
    cin >> a[i];
  BIT fw(1e6);
  fw.upd(a[1], 1);
  for(int i = 2; i <= n; i++){
    if(a[i] < a[i - 1])break;
    if(!fw.get(a[i], a[i]))fw.upd(a[i], 1);
    idx = i;
  }
  int ans = 1;
  vector < int > cur{a[idx + 1]};
  for(int i = idx + 2; i <= n; i++){
    if(a[i] < a[i - 1]){
      for(auto j : cur){
        if(!fw.get(j, j))
          fw.upd(j, 1);
      }
      cur = {a[i]};
      ans++;
      continue;
    }
    cur.push_back(a[i]);
    int chk = fw.get(cur[0] + 1, cur.back() - 1);
    if(chk > 0){
      cur.pop_back();
      for(auto j : cur){
        if(!fw.get(j, j))
          fw.upd(j, 1);
      }
      cur = {a[i]};
      ans++;
    }
  }
  cout << ans + 1 << "\n";
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55