Submission #914056

#	Time	Username	Problem	Language	Result	Execution time	Memory
914056		LCJLY	Coreputer (IOI23_coreputer)	C++17	100 / 100	1 ms	592 KiB

coreputer

#include "coreputer.h"
#include <bits/stdc++.h>
using namespace std;
 
vector<int>malfunctioning_cores(int n) {
	int l=0;
	int r=n-2;
	int mid;
	int best=n-1;
	bool even=false;
	while(l<=r){
		mid=(l+r)/2;
		vector<int>v;
		for(int x=0;x<=mid;x++){
			v.push_back(x);
		}
		int hold=run_diagnostic(v);
		if(hold==1||hold==0){
          	if(hold==0) even=true;
			best=mid;
			r=mid-1;
		}
		else l=mid+1;
	}
	if(best==0){
		vector<int>hayden;
		if(even){
			l=0;
			r=n-1;
			int best2=n-1;
			while(l<=r){
				mid=(l+r)/2;
				vector<int>v;
				for(int x=0;x<=mid;x++){
					v.push_back(x);
				}
				int hold=run_diagnostic(v);
				if(hold==1){
					r=mid-1;
					best2=mid;
				}
				else l=mid+1;
			}	
			
			
			for(int x=0;x<n;x++){
				if(x==0||x==best2) hayden.push_back(1);
				else hayden.push_back(0);
			}
		}
		else{
			hayden.push_back(1);
			for(int x=1;x<n;x++) hayden.push_back(0);
		}
		return hayden;
	}
	set<int>se;
	se.insert(best);
	for(int x=best+1;x<n;x++){
		vector<int>v;
		if(x==n-1&&se.empty()){
			se.insert(n-1);
			continue;
		}
		for(int y=0;y<=x;y++){
			if(se.find(y)!=se.end()) continue;
			v.push_back(y);
		}
		int hold=run_diagnostic(v);
		if(hold==0) even=true;
		if(hold==1||hold==0){
			se.insert(x);
		}
	}
	int best2=n;
	set<int>se2;
	if(even){
		best2=*se.begin();
		se2.insert(*se.begin());
		se.erase(se.begin());
		se2.insert(*se.begin());
		se.erase(se.begin());
	}
	else{
		best2=*se.begin();
		se2.insert(*se.begin());
	}
	for(int x=best2-1;x>=1;x--){
		vector<int>v;
		for(int y=n-1;y>=x;y--){
			if(se2.find(y)!=se2.end()) continue;
			v.push_back(y);
		}
		int hold=run_diagnostic(v);
		if(hold==1||hold==0){
			se2.insert(x);
		}
	}
	
	for(auto it:se2) se.insert(it);
	if(!even&&se.size()%2==0) se.insert(0);
	if(even&&se.size()%2==1) se.insert(0);
	vector<int>ans;
	for(int x=0;x<n;x++){
		if(se.find(x)==se.end()) ans.push_back(0);
		else ans.push_back(1);
	}
	return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40