Submission #576923

#	Time	Username	Problem	Language	Result	Execution time	Memory
576923		CSQ31	The Collection Game (BOI21_swaps)	C++17	57 / 100	7 ms	384 KiB

swaps

#include "swaps.h"
#include <bits/stdc++.h>
#define sz(a) (int)(a.size())
#define pb push_back
using namespace std;
int nn,pw = 1;
vector<int>v;
void bitonic(int n){
	if(n==1)return;
	int z = n/2;
	for(int i=0;i<pw;i+=2*z){
		for(int j=i;j<i+z;j++){
			if(max(v[j],v[j+z]) <= nn)schedule(v[j],v[j+z]);
		}
	}
	vector<int>res = visit();
	int k = 0;
	for(int i=0;i<pw;i+=2*z){
		for(int j=i;j<i+z;j++){
			if(max(v[j],v[j+z]) <= nn){
				if(!res[k])swap(v[j],v[j+z]);
				k++;
			}else if(v[j] >nn)swap(v[j],v[j+z]);
		}
	}
	bitonic(n/2);
	
}
void merge(int n){
	if(n==1)return;
	merge(n/2);
	int z = n/2;
	for(int i=0;i<pw;i+=2*z){
		for(int j=i;j<i+z;j++){
			if(max(v[j],v[j+z]) <= nn)schedule(v[j],v[j+z]);
		}
	}
	vector<int>res = visit();
	int k = 0;
	for(int i=0;i<pw;i+=2*z){
		for(int j=i+z;j<i+2*z;j++){
			int inv = j-i-z;
			inv = z-inv-1;
			inv = i+z+inv;
			if(inv > j)swap(v[j],v[inv]);
		}
	}
	bitonic(n);
	
}
void solve(int n,int V){
	nn = n;
	while(pw<n)pw*=2;
	for(int i=1;i<=pw;i++)v.push_back(i);
	merge(pw);
	vector<int>fin;
	for(int x:v)if(x<=n)fin.pb(x);
	answer(fin);
}

Compilation message (stderr)

swaps.cpp: In function 'void merge(int)':
swaps.cpp:40:6: warning: unused variable 'k' [-Wunused-variable]
   40 |  int k = 0;
      |      ^

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 3 / 3
• Subtask 4: 0 / 2
• Subtask 5: 9 / 9
• Subtask 6: 0 / 6
• Subtask 7: 9 / 9
• Subtask 8: 0 / 6
• Subtask 9: 21 / 21
• Subtask 10: 0 / 14
• Subtask 11: 0 / 9
• Subtask 12: 0 / 6