Submission #936571

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
936571	2024-03-02 08:01:24	abcdehello	Group Photo (JOI21_ho_t3)	C++17	100 / 100	2886 ms	99924 KiB

Main

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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
int n,a[5050],dp[5050],cnt[5050][5050],ind[5050];//cnt[i][j]=count of a[x] (x<i) s.t. a[x]>=j
ordered_set st;
int count(int l,int r){
  return (cnt[r][n]-cnt[r][r])-(cnt[l-1][n]-cnt[l-1][r]);
}
int main(){
  cin >> n;
  for (int i=1;i<=n;i++) cin >> a[i],ind[a[i]]=i;
  //for (int i=1;i<=n;i++) ind[i]+=ind[i-1];
  for (int i=1;i<=n;i++){
    for (int j=1;j<i;j++){
      cnt[a[i]][a[j]]++,cnt[a[i]][n+1]--;
    }
    for (int j=1;j<=n+1;j++) cnt[a[i]][j]+=cnt[a[i]][j-1];
  }
  for (int i=1;i<=n;i++){
    for (int j=1;j<=n;j++) cnt[i][j]+=cnt[i-1][j];
  }
  dp[0]=0;
  ind[0]=INT_MAX;
  for (int i=1;i<=n;i++){
    dp[i]=INT_MAX;
    int cnt=0;
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 32 / 32
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36